8-Week Intermediate Gravel Training Plan for 100 Miles

Q: Is 8 weeks enough to train for a 100-mile gravel event?

Yes, if you already have a strong aerobic base and can ride 3+ hours on gravel comfortably. The 8-week plan assumes you are not starting from scratch. If you cannot ride 3 hours on mixed surfaces, choose the 12 or 16-week version instead.

Q: What FTP do I need for a 100-mile gravel century?

There is no minimum FTP. What matters is your ability to sustain a comfortable pace on mixed surfaces for 6-8 hours. The plan teaches you to pace at 76-85% of your FTP, adjusted for surface conditions.

Q: How is gravel century pacing different from road century pacing?

Gravel century pacing requires constant adjustment for surface changes and demands more conservative early pacing. Power that feels sustainable on pavement becomes much harder on loose gravel. You also burn more calories per hour on gravel due to the variable effort pattern.

Q: How much food should I carry for a 100-mile gravel event?

Plan for 60-90g of carbohydrates per hour for 6-8 hours. That is roughly 360-720g of carbs total. Carry enough to be self-sufficient for the entire distance, even if the event has aid stations. Gravel aid stations are less reliable than road events.

Q: Can I do this plan on an indoor trainer?

Weekday interval sessions work well indoors. However, do your long Saturday rides on actual gravel. Indoor training cannot prepare you for the sustained vibration, surface transitions, and nutrition logistics of 6-8 hours on mixed terrain.

Q: What tire pressure should I run for a gravel century?

For 40mm tires on a tubeless setup, start around 30-35 psi for a 70kg rider. Over 100 miles, slightly lower pressure (2-3 psi less than a 50-mile event) reduces fatigue. Test on training rides.

This 8-week plan prepares intermediate gravel cyclists for a 100-mile gravel century using power and heart rate zones. The compressed timeline means faster weekly progression, so consistency is critical. It assumes you already have a strong aerobic base and can ride 3+ hours comfortably on mixed surfaces. The plan uses gravel climb repeats, mixed-surface tempo, and progressive long rides to prepare you for the unique demands of 100 miles on unpaved terrain.

IntermediateGravel100 Miles

This plan assumes

Effort system Power zones (% FTP) + HR zones (% max HR)

Weekly hours 6-10h

Rides per week 5

Are you ready for this plan?

Can ride continuously for 3 hours at a comfortable pace on mixed surfaces
Have a power meter and heart rate monitor
Know your current FTP (tested within the last 6 weeks)
Own a gravel bike with wide tires (38-45mm) and tubeless setup
Can commit to 5 rides per week for 8 weeks

If you cannot ride for 3 hours comfortably on gravel or do not have a power meter, start with a beginner plan or a 50-mile plan first. Start here instead.

Plan overview

Base Weeks 1-2

Solidify your aerobic base with sustained Zone 2 gravel efforts. Long rides start at 3 hours and weekday rides include tempo blocks to raise your aerobic ceiling quickly.

7-8 hours/week

Build Weeks 3-6

Introduce sweet spot and threshold intervals with gravel climb repeats to raise FTP. Long rides extend to 4.5+ hours with sections at gravel century pace. Back-to-back weekend efforts simulate race-week fatigue.

8-10 hours/week

Peak Weeks 7

Highest quality sessions with gravel century simulations and pacing rehearsals. Volume begins to taper but intensity stays high.

9-10 hours/week

Taper Weeks 8

Reduce volume by 40-50% while keeping two short, sharp sessions. Focus on sleep, nutrition prep, tire setup, and equipment checks. You should feel restless by race day.

4-5 hours/week

Weekly structure

Mon Rest

Tue Intervals

Wed Easy endurance

Thu Gravel climb repeats / Threshold

Fri Rest

Sat Long gravel ride

Sun Recovery ride

Training zones

This plan uses power zones (% of FTP) and heart rate zones (% of max HR) to guide effort. A power meter and heart rate monitor are required.

Power zones

Zone	% FTP	RPE	Feel
Z1 Recovery	0-55% FTP	1-2 out of 10	Extremely easy. No sensation of effort. Used only for recovery rides.
Z2 Endurance	56-75% FTP	3-4 out of 10	Comfortable, sustainable effort. You are working but could maintain this for hours on gravel.
Z3 Tempo	76-90% FTP	5-6 out of 10	Moderately hard. Sustainable for 30-60 minutes but requires concentration, especially on loose surfaces.
Z4 Threshold	91-105% FTP	7-8 out of 10	Hard. You can sustain this for 20-40 minutes with focus. Speaking is difficult. On gravel climbs, this is your ceiling.
Z5 VO2max	106-120% FTP	8-9 out of 10	Very hard. Maximum sustainable effort for 3-8 minutes. Legs and lungs burn.
Z6 Anaerobic Capacity	121-150% FTP	9-10 out of 10	Maximum effort for 30 seconds to 2 minutes. Not sustainable.
Z7 Neuromuscular Power	150%+ FTP	10 out of 10	All-out sprint for under 30 seconds. Pure explosive effort.

Heart rate zones

Zone	% Max HR	Feel
Z1 Recovery	0-59% max HR	Extremely easy. No sensation of effort. Used only for recovery rides.
Z2 Endurance	60-70% max HR	Comfortable, sustainable effort. You are working but could maintain this for hours on gravel.
Z3 Tempo	71-80% max HR	Moderately hard. Sustainable for 30-60 minutes but requires concentration, especially on loose surfaces.
Z4 Threshold	81-90% max HR	Hard. You can sustain this for 20-40 minutes with focus. Speaking is difficult. On gravel climbs, this is your ceiling.
Z5 VO2max	91-100% max HR	Very hard. Maximum sustainable effort for 3-8 minutes. Legs and lungs burn.

8-week training plan

5 rides per week building from 7h in week 1 to a peak of 10h before tapering. All sessions use power zones (% FTP) with heart rate as a secondary reference. Compressed timeline requires strong starting fitness.

Day	Session	Duration
WEEK 1
Mon	Rest	-
Tue	Gravel endurance + 3x10min mixed-surface tempo @ 76-90% FTP / 71-80% HR	80 min
Wed	Easy endurance @ 56-75% FTP / 60-70% HR	60 min
Thu	Gravel endurance + 2x12min tempo @ 76-90% FTP / 71-80% HR	80 min
Fri	Rest	-
Sat	Long gravel endurance @ 56-75% FTP / 60-70% HR	3h
Sun	Recovery @ 0-55% FTP / 0-59% HR	50 min
WEEK 2
Mon	Rest	-
Tue	Gravel endurance + 3x12min mixed-surface tempo @ 76-90% FTP / 71-80% HR	85 min
Wed	Easy endurance @ 56-75% FTP / 60-70% HR	60 min
Thu	Gravel endurance + 2x15min sweet spot @ 88-93% FTP / 71-80% HR	85 min
Fri	Rest	-
Sat	Long gravel endurance @ 56-75% FTP / 60-70% HR	3h 15min
Sun	Recovery @ 0-55% FTP / 0-59% HR	50 min
WEEK 3
Mon	Rest	-
Tue	Gravel endurance + 3x15min sweet spot @ 88-93% FTP / 71-80% HR	90 min
Wed	Easy endurance @ 56-75% FTP / 60-70% HR	60 min
Thu	Gravel climb repeats: 3x10min @ 91-105% FTP / 81-90% HR	85 min
Fri	Rest	-
Sat	Long gravel endurance + century pace sections @ 76-85% FTP / 71-80% HR	3h 30min
Sun	Recovery @ 0-55% FTP / 0-59% HR	55 min
WEEK 4
Mon	Rest	-
Tue	Gravel endurance + 3x15min sweet spot @ 88-93% FTP / 71-80% HR	90 min
Wed	Easy endurance @ 56-75% FTP / 60-70% HR	60 min
Thu	Gravel climb repeats: 2x15min @ 91-105% FTP / 81-90% HR	85 min
Fri	Rest	-
Sat	Long gravel endurance + century pace @ 76-85% FTP / 71-80% HR	3h 45min
Sun	Recovery @ 0-55% FTP / 0-59% HR	55 min
WEEK 5
Mon	Rest	-
Tue	Gravel endurance + 2x20min sweet spot @ 88-93% FTP / 71-80% HR	90 min
Wed	Easy endurance @ 56-75% FTP / 60-70% HR	60 min
Thu	Gravel climb repeats: 2x20min @ 91-105% FTP / 81-90% HR	90 min
Fri	Rest	-
Sat	Long gravel endurance + century pace @ 76-85% FTP / 71-80% HR	4h
Sun	Recovery @ 0-55% FTP / 0-59% HR	55 min
WEEK 6
Mon	Rest	-
Tue	Gravel endurance + 3x15min sweet spot @ 88-93% FTP / 71-80% HR	90 min
Wed	Easy endurance @ 56-75% FTP / 60-70% HR	60 min
Thu	Gravel climb repeats: 2x20min @ 91-105% FTP / 81-90% HR	90 min
Fri	Rest	-
Sat	Long gravel endurance + century pace @ 76-85% FTP / 71-80% HR	4h 30min
Sun	Recovery @ 0-55% FTP / 0-59% HR	55 min
WEEK 7
Mon	Rest	-
Tue	Gravel endurance + 2x20min sweet spot @ 88-93% FTP / 71-80% HR	90 min
Wed	Easy endurance @ 56-75% FTP / 60-70% HR	60 min
Thu	Gravel century simulation: 2x30min @ 76-85% FTP / 71-80% HR	90 min
Fri	Rest	-
Sat	Long gravel endurance + pace rehearsal @ 76-85% FTP / 71-80% HR	4h 30min
Sun	Recovery @ 0-55% FTP / 0-59% HR	55 min
WEEK 8
Mon	Rest	-
Tue	Easy gravel endurance + 2x8min tempo @ 76-90% FTP / 71-80% HR	55 min
Wed	Rest	-
Thu	Activation: 2x5min @ 91-105% FTP / 81-90% HR	45 min
Fri	Rest	-
Sat	Gravel Century Day: 100 Miles	6-8h
Sun	Rest	-

📥 Download free 8-week plan (PDF)

This plan is not personalized for you

This plan uses Power zones (% FTP) and HR zones (% max HR) effort guidance and assumes 6-10h/week of available training time. Here is what a generic plan cannot account for:

All power targets are expressed as percentages of your FTP. If you have not tested your FTP recently, every interval target may be too easy or too hard for your actual fitness level. Test before starting the plan.
Weekly volume is fixed, but your real available time changes week to week. This plan cannot adjust when your schedule shifts.
Gravel surfaces vary enormously. This plan cannot account for your specific local terrain, whether that is packed dirt, loose rock, or sandy double track.
If you miss a session, the plan does not recalibrate. You either fall behind or skip ahead, and both compromise the training progression.
There is no feedback loop. This plan does not read your power data, sleep quality, or HRV to adjust intensity. An AI coach does this automatically every week.

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Week-by-week breakdown

Week 1 Base 🕐 7h 30min

Gravel century base

Focus: Establish the 5-ride structure with a 3-hour long ride. Tempo blocks build from 10 minutes.

Key session: Saturday long gravel ride: 3h at Zone 2 (56-75% FTP). Practice nutrition every 30 minutes on smooth sections.

What to feel: Controlled and comfortable. The 3-hour ride should feel manageable since you need to reach 4.5 hours by week 6.

Avoid: Starting too aggressively. This is a short plan, but week 1 is still about establishing the base, not testing your limits.

Week 2 Base 🕐 7h 55min

Sweet spot introduction

Focus: First sweet spot intervals at 88-93% FTP. Long ride grows to 3h 15min.

Key session: Thursday: 2x15min sweet spot at 88-93% FTP. This is the upper end of what feels sustainable.

What to feel: Sweet spot should feel genuinely hard but completable. On gravel, power will fluctuate; focus on the average.

Avoid: Confusing sweet spot with threshold. Sweet spot is 88-93% FTP, not 95-105%.

Week 3 Build 🕐 8h 30min

Gravel climb repeats and century pace

Focus: First gravel climb repeats at threshold. Long ride at 3h 30min with century pace sections.

Key session: Thursday: gravel climb repeats, 3x10min at 91-105% FTP. Stay seated for traction and smooth cadence.

What to feel: Threshold should feel hard. Speaking is difficult. On gravel climbs, this is your ceiling effort.

Avoid: Standing and surging on gravel climbs. Stay seated when possible for traction and energy conservation.

Week 4 Build 🕐 8h 45min

Threshold extension

Focus: Climb repeats extend to 15 minutes. Long ride reaches 3h 45min with century pace blocks.

Key session: Saturday: 3h 45min with century pace sections at 76-85% FTP. This is your target effort for the full 100 miles.

What to feel: Century pace should feel sustainable on gravel. If it feels hard, your FTP estimate may be too high.

Avoid: Tire pressure too high for loose surfaces. Lower pressure 5-10 psi below your road setup.

Week 5 Build 🕐 9h 25min

Volume peak

Focus: Highest volume week. Climb repeats at 20 minutes. Long ride reaches 4 hours.

Key session: Saturday: 4h with century pace sections. Simulate race conditions: eat what you plan to eat, run race-day tire pressure.

What to feel: Tired by Thursday but capable by Saturday. The 4-hour ride should be hard but not devastating.

Avoid: Burning matches on gravel climbs. Save energy for the second half when fatigue amplifies surface difficulty.

Week 6 Build 🕐 9h 45min

Final build

Focus: Last high-intensity build week. Long ride at 4h 30min, the longest training ride of the plan.

Key session: Saturday: 4h 30min with century pace blocks. This is your longest ride. Do not try to simulate the full 100 miles.

What to feel: Strong and confident. The century pace sections should feel controlled and repeatable.

Avoid: Trying to ride the full 100 miles in training. The peak ride is 4h 30min, not 6-8h. The taper and adrenaline cover the gap.

Week 7 Peak 🕐 9h 15min

Century simulation

Focus: Century simulation: 2x30min at gravel century pace. Long ride at 4h 30min with pace rehearsal.

Key session: Thursday: gravel century simulation, 2x30min at 76-85% FTP on mixed surfaces. Hold perfectly even power.

What to feel: The simulation should feel hard but doable. If you can hold power for both 30-minute blocks on gravel, you are ready.

Avoid: Treating the simulation as a time trial. It is a pacing exercise, not a max effort.

Week 8 Taper 🕐 ~5h (including race)

Race week

Focus: Two short rides to stay loose. Tuesday easy tempo, Thursday activation. Saturday is century day.

Key session: Saturday: 100-mile gravel century. Start at Zone 2, build to century pace by mile 20, eat on smooth sections every 20 minutes, and manage effort across surfaces.

What to feel: Restless, eager, and slightly nervous. Trust the 7 weeks of work behind you.

Avoid: Going out too fast in the first 20 miles. Gravel century pacing is everything. Start conservative, finish strong.

Fueling your training

Gravel century nutrition is the hardest challenge in endurance cycling. Rough surfaces make it harder to eat and drink, aid stations are sparse, and 6-8 hours of variable effort on mixed terrain demands more fuel than the same distance on pavement.

🍌 Before rides

Eat a carb-rich meal 3 hours before longer rides. Aim for 100-150g of carbohydrates: rice, oatmeal, toast with honey, or pasta. For early morning rides, a smaller meal of 60-80g carbs 90 minutes before is sufficient.

⚡ During rides

For rides over 90 minutes, aim for 60-90 grams of carbohydrates per hour. On gravel, plan your eating for smooth sections where you can safely reach into your frame bag. Start eating at minute 20. For a 100-mile gravel event, carry more food than you think you need since aid stations may be sparse or nonexistent.

🥛 After rides

Within 30 minutes of finishing, consume 1.2g of carbohydrates per kilogram of body weight plus 20-30g of protein. Recovery nutrition is especially important during a compressed 8-week plan where weekly training load is high.

💧 Hydration

Drink 500-750ml per hour depending on temperature and sweat rate. Use electrolyte mix in your bottles. On a gravel century, carry at least two large bottles plus extra in your frame bag. Know where water stops are on the course.

🏁 Race day

Eat your pre-ride meal 3 hours before start. Carry enough nutrition for 6-8 hours: budget 60-90g carbs per hour. Pack everything in your frame bag and top tube bag. Know where aid stations are and what they serve. Carry backup nutrition in case aid stations are sparse. Never try new food on race day.

Gear checklist

Essential

Power meter Essential for pacing a gravel century. Without power data, you risk blowing up after mile 60 when fatigue amplifies every surface imperfection.

Heart rate monitor Secondary effort reference and cardiac drift detection. Over 6-8 hours, cardiac drift becomes significant and heart rate helps you recognize when to back off.

Gravel bike with drop bars A gravel-specific frame with tire clearance, compliance, and multiple hand positions is essential for 6-8 hours on mixed surfaces.

Wide tires (38-45mm) with appropriate tread Wider tires at lower pressure provide the grip, comfort, and confidence needed for 100 miles of mixed-surface riding.

Tubeless setup with sealant Tubeless tires seal small punctures automatically. Over 100 miles of gravel, the probability of debris encounters is near certain.

Frame bag or top tube bag Carries nutrition, tools, and spares for a self-supported 100-mile effort. On gravel, you need everything accessible without stopping.

Nice to have

GPS computer with route loaded Displays real-time power, heart rate, distance, and route navigation. On a 100-mile gravel course, knowing what is ahead prevents pacing mistakes.

Tire plug kit, spare tube, and CO2 inflator Over 100 miles, carry backup for your backup. A plug kit, a spare tube, and two CO2 cartridges cover most scenarios.

Padded bar tape or ergonomic grips Reduces hand and arm fatigue from vibration. Over 100 miles of rough surfaces, hand fatigue becomes a serious limiter.

5 mistakes that derail intermediate plans

Running tire pressure too high for gravel surfaces

High tire pressure reduces grip, increases vibration, and leads to faster fatigue on rough surfaces. Over 100 miles, the cumulative effect of wrong pressure is devastating.

✅ Fix: Lower tire pressure 5-10 psi below your road setup. For 40mm tires, start around 30-35 psi and adjust based on your weight and surface conditions.

Burning matches on gravel climbs in the first half

Gravel climbs often take longer than they appear because loose surfaces reduce traction and efficiency. On a century, every surge above threshold in the first 50 miles costs you double in the second 50.

✅ Fix: Cap gravel climb efforts at 105% FTP for the first 60 miles. Stay seated for traction. Save your matches for the final 20 miles when positioning matters.

Hand and arm fatigue from gripping too tight

Rough surfaces cause riders to grip the handlebars tightly. Over 6-8 hours, this leads to hand numbness, forearm pump, and shoulder tension that can force you to stop.

✅ Fix: Consciously relax your grip every 10 minutes. Move hand positions frequently. Consider padded bar tape and gel pads for century distance.

Not carrying enough nutrition for the full distance

Gravel centuries have fewer aid stations than road events. Running out of food at mile 70 on a remote gravel road is a race-ending situation with no easy fix.

✅ Fix: Carry enough nutrition for the full distance. Budget 60-90g carbs per hour for 6-8 hours. Use a frame bag to carry backup food beyond what aid stations provide.

Ignoring surface transitions in pacing

Power that feels sustainable on pavement becomes unsustainable on loose gravel. Over 100 miles, failing to adjust for surface changes leads to early fatigue.

✅ Fix: Reduce power by 5-10% when transitioning from pavement to loose gravel. Let heart rate confirm your adjusted effort is in the right zone.

Ride day tips

Pace the first 30 miles conservatively

On a gravel century, the race starts at mile 50. Everything before that is positioning. Set a power ceiling of 80% FTP for the first 30 miles regardless of how easy it feels. The adrenaline of race day makes the first miles feel effortless, but the bill arrives at mile 70.

Eat on smooth sections, plan for rough ones

Know the course surface profile and plan nutrition for smooth sections. Carry easy-to-open food in your top tube bag. Practice opening gels and drinking with one hand on every training ride.

Lower tire pressure and trust it

Lower pressure means more grip, more comfort, and less fatigue. It feels slower but it is faster over 100 miles. The comfort savings compound over 6-8 hours.

Break the century into segments mentally

Do not think about 100 miles. Think about the next aid station, the next 10 miles, the next climb. Mental fatigue on gravel is amplified by surface difficulty, and chunking the distance keeps your head in the ride.

Why a personalized plan outperforms this one

This plan provides a solid framework for gravel century preparation. But a plan built from your actual power data, recovery metrics, and weekly schedule adapts to you instead of asking you to adapt to it.

Aspect	This plan	Personalized plan
Power targets	All intervals based on generic % FTP ranges. Without a recent FTP test, targets may not match your actual fitness.	✓ Intervals calibrated to your tested FTP, updated after every test and performance breakthrough.
Weekly volume	Fixed at 6-10 hours per week for every rider.	✓ Adjusted to your real available hours, which can change week to week based on life and work.
Surface specificity	Generic gravel instructions that may not match your local terrain.	✓ Sessions adapted to your specific race course surface profile and local training terrain.
Missed sessions	Plan does not adjust. You fall behind or skip ahead.	✓ Plan recalibrates the following week based on what you actually completed.
Race-specific preparation	Generic gravel century pacing for a typical mixed-surface course.	✓ Adjusts interval profiles and long ride structure based on your specific race course profile and surface breakdown.