How to Train for Your First Century Ride in 8 Weeks

To ride your first metric century (100 km, or 62 miles) you need 8 weeks if you can already handle 25-30 miles (40-50 km) without trouble: three rides a week, with a long ride that builds from 31 to 56 miles (50 to 90 km), one recovery week and one taper week before the event. The rest comes down to pacing and food: ride easy almost the whole time and take in 30-60 g of carbohydrate per hour from the start.

A note on distance: in the US, a century usually means 100 miles (161 km), and a metric century means 100 km. Most gran fondos, charity rides and club events offer both, and the metric century is the classic first goal. This plan is built for 100 km; further down you’ll find how to stretch it to a full 100 miles.

Below: how long the ride will take at your wattage, the week-by-week plan, how to pace the day itself, what to eat, and what to bring.

How long will your century take?

We calculated moving time on a typical 62-mile (100 km) course with 3,300 ft (1,000 m) of climbing: 12.4 miles (20 km) of climbing at 5%, 12.4 miles of descending and 37.3 miles (60 km) of flat. The rider weighs 165 lb (75 kg) on a 20 lb (9 kg) bike, rides solo with hands on the hoods on the flats, puts out 10% more power on the climbs, coasts the descent and tops out at 28 mph (45 km/h) going down. We used the physics model from Martin et al. (1998), the same one behind our power and speed calculator.

Three things to keep in mind:

• These are moving times with no wind. Add your stops: on a supported ride with two rest stops, 20-30 minutes is normal.
• In a group you’ll go faster for the same effort, because drafting cuts the energy you spend pushing through the air.
• If you don’t know your watts, estimate your power from a ride you know well in the power and speed calculator. The watts for each speed on the flat chart gives the power numbers for each speed.

The 8-week century training plan

The plan assumes you already ride at least twice a week and can do 25-30 miles (40-50 km) without finishing wrecked. If not, spend 3-4 weeks first riding regularly at an easy pace.

Intensities refer to power or heart rate zones: zone 2 is a comfortable pace where you can hold a conversation; zone 3 is a brisk pace where you can only get out short phrases.

Why it’s built this way:

• The long ride is what matters. It gets your legs, back, saddle contact points and stomach used to several hours on the bike. The other two rides keep your fitness ticking over.
• Most of the time, easy. Endurance athletes do roughly 80% of their sessions at low intensity (Seiler, 2010). Going hard on every ride leaves you too tired for the long one.
• Week 4 is a recovery week so your body can absorb the work. Weeks 7 and 8 cut back so you arrive fresh.
• Week 6 is the rehearsal. Ride 56 miles in the kit, with the food and at the pace you’ll use on the day. If something goes wrong (chafing, aches, a gel that doesn’t sit well), you still have two weeks to fix it.

If your event has a long climb, add a 30-40 minute climb to your long rides in weeks 5 and 6; there’s a dedicated plan in how to prepare for your first big climb.

Scaling the plan to a full 100-mile century

A 100-mile (161 km) century is not just “a bit longer”: it’s 60% more distance and, at the same pace, about 2.5 more hours in the saddle. On the same course profile scaled up (about 5,300 ft / 1,600 m of climbing), our model gives these moving times for the same 165 lb rider:

How to adapt the plan:

1. Start from a metric century, not from scratch. Ideally, finish this 8-week plan (or already be riding 50-60 miles comfortably) before building toward 100 miles.
2. Stretch it to 10-12 weeks. Keep the same structure (one long ride, two shorter rides, a recovery week every third or fourth week), and add 6-10 miles (10-15 km) to the long ride each building week.
3. Peak at 75-85 miles (120-135 km) two to three weeks before the event. You don’t need to ride 100 miles in training; the event-day atmosphere, the rest stops and drafting cover the gap.
4. Treat food as part of the training. Over 6-7 hours, missing your carbs early catches up with you hard. Practice 45-60 g per hour on every long ride.
5. Taper a little longer: cut volume by about half in the final week and do the last long ride 10-14 days out.

Pacing on event day

1. Start slower than your legs want to. At the start of a gran fondo or charity ride everyone is excited and the pace is high. Ride the first 12 miles (20 km) in zone 2, even if people pass you.
2. Ride climbs at a steady effort. Keep heart rate or power out of zone 4, and shift into your easiest gear early. If you’re not sure your bike has low enough gearing, see what gearing you need for climbing.
3. Find a group at your level on the flats. Drafting saves a lot of energy. Riding two abreast and in groups is legal in many states, but rules vary; check the bike laws where you ride. Either way, stay alert: no sudden moves, and point out potholes.
4. Don’t linger at rest stops. Refill bottles, grab food and roll on: standing around, your legs cool down.
5. Save something for the last 12 miles (20 km). If you’ve still got legs, pick up the pace there, not before.

Century ride nutrition: what to eat and drink

With 4-4.5 hours of effort for a metric century (and 6-7 hours for a full one), food is not optional.

• Breakfast: 2-3 hours before, carb-rich and familiar: toast or a bagel, oatmeal, fruit, a bit of honey or jam. Low fat and low fiber.
• On the bike: 30-60 g of carbohydrate per hour (Burke et al., 2011), starting in the first hour. Over 4 hours, that’s 120-240 g. For example: one bottle of sports drink per hour plus a bar or gel every 45 minutes. On rides longer than 2.5 hours you can go up to 90 g/h if your gut is trained for it, but for a first century 40-60 g/h is a good target.
• Fluids: one 17-25 fl oz (500-750 ml) bottle per hour on mild days, and more in the heat. The ACSM guideline is to avoid losing more than 2% of your body weight during exercise.
• Nothing new on event day. Whatever you eat and drink, test it first on the long rides in weeks 3, 5 and 6.

There’s more detail, including sodium and how to measure your sweat rate, in on-the-bike nutrition. To see how many calories your rides burn, use the cycling calorie calculator.

Century ride checklist

The bike, one week before (not the night before):

• Brakes that bite firmly, with pads that have life left. If in doubt, take it to a shop.
• Chain clean and not overly worn. See when to replace your chain.
• Tires free of cuts and at the right pressure for your weight: bike tire pressure.
• Shifting that’s clean across every cog, especially the big ones. If any gear hesitates, here’s how to adjust a rear derailleur.
• A riding position you’ve tested on long rides. Don’t change your saddle or cleats in the final week; if something bothers you, sort it out earlier with a bike fit at home.

What you carry:

• A helmet (required by almost every organized ride, whatever your state’s law says).
• Two bottles and enough food for the whole course, even if there are rest stops.
• A flat kit: spare tube or plugs, tire levers, mini pump or CO₂. If you’ve never used it, practice at home with how to fix a flat.
• A vest or rain jacket if there’s a big climb or rain in the forecast, your phone, ID and a little cash.
• Bib shorts and chamois cream you’ve already used on long rides.

Common mistakes

• Doing your first truly long ride on event day. That’s what week 6 is for.
• Jumping on the wheel of the front group. You’ll burn out in 12 miles and pay for it over the next 50.
• Eating only at rest stops. Carry your own food and start eating in the first hour.
• Trying anything new: shorts, shoes, a gel or a new position.
• Training hard in the final week to “make sure.” The fitness is already built; now it’s time to rest.

Once you’ve got your first century done, the next step is longer gran fondos with serious climbing: see our guide to gran fondos and century rides.

Updated October 19, 2026 ·Report an error on this page