Every spring, riders sign up for a summer gran fondo, do the same two-hour Sunday loop at the same comfortable pace for a few months, and show up on event day hoping momentum carries them through. It usually doesn’t. They finish, but they finish empty — cramping on the last climb, walking sections they could have ridden, wondering what went wrong when the training “felt fine.”
The training wasn’t wrong exactly. It just wasn’t specific to what a gran fondo actually asks of you.
I’ve ridden a handful of these and the pattern is always the same. The riders who struggle aren’t undertrained in the general sense. They’re undertrained in the three specific ways a gran fondo tests you: sustained aerobic endurance, repeated climbing efforts on tired legs, and a fuelling problem that gets harder every hour you’re out there. This guide covers what actually builds those three things, plus the pacing and fuelling lessons I wish someone had handed me before my first one.
What a Gran Fondo Actually Demands
A gran fondo typically runs 100-180km with meaningful climbing — often 1,500 to 3,500 meters of elevation gain depending on the course. For most amateur riders, that’s somewhere between four and seven hours in the saddle.
That length changes the math. A pure endurance ride at an easy, conversational pace is one kind of physical problem. A 20-40 minute climb showing up in hour five, on legs that already have four hours in them, is a completely different one. A solid gran fondo training plan has to build not just volume, but the ability to produce power when you’re already tired.
Fuelling is the second demand, and it’s the one most first-timers underestimate. A five-hour ride at a moderate effort can burn 3,000-3,500 calories. Even eating well on the bike, you’re running a real deficit by the finish. Riders who haven’t practiced eating enough during training are the ones cramping and bonking around hour three because they ran out of fuel, not because they weren’t fit enough.
The third demand is pacing discipline. Gran fondos are won or lost in the first 90 minutes. Riders who chase an early group or push too hard on the first climb because everyone around them is going for it have nothing left when the ride actually gets hard. Training for a fondo means training your pacing as much as your fitness.
Building Your Training Block
Base phase — building the aerobic engine
This is where the real fitness gets built, and it’s the phase people skip past too quickly. The goal is simple: raise your ability to ride comfortably at an easy, sustainable effort for longer and longer stretches, without it costing you the next day.
Most of your riding here should genuinely feel easy — not moderate, not “a bit of a push,” actually easy. That’s the part people get wrong. Riding everything at a medium effort trains you to be mediocre at everything instead of strong at the things that matter. Research on polarized training for endurance athletes backs this up consistently — the athletes who do best split their training between genuinely easy and genuinely hard, with not much in between.
Build your long ride gradually across four to six weeks: if you’re starting from a solid base, something like three hours, then three and a half, then four, with an easier week worked in before you push further. If a four-hour ride still feels crushing rather than manageable by the end of this phase, give yourself more time here before moving on.
Build phase — climbing-specific power
Once the aerobic base is solid, shift some of your quality riding toward sustained efforts — 15-25 minutes at a hard-but-controlled effort, the kind of intensity a real climb demands. This is also where you start layering harder efforts into your long ride itself: a climb-simulation block two or three hours into a long ride teaches your body to produce power on tired legs, which is exactly what a fondo asks of you in the back half.
Taper — arriving fresh, not flat
The final one to two weeks before your event should cut volume noticeably — by a third or more — while keeping a little bit of intensity in the legs. Riders who train hard right up to race week show up tired. Riders who do nothing at all in the final week show up flat and undersharpened. The sweet spot is less riding, but not less effort.
A Realistic Weekly Structure
You don’t need 12-14 hours a week to finish a gran fondo strong. Most amateur riders do well on something closer to this, adjusted for your own schedule:
- One long ride on the weekend — this is the single most important session of the week
- One or two quality sessions midweek — sustained efforts or climbing-specific work
- The rest: easy riding or rest
If you can only protect one session when life gets busy, protect the long ride. Skip a Tuesday interval before you skip that. I go into more detail on how I actually structure a training week in The Power of Structured Training — the same principles apply here, just aimed at your specific event.
Fuelling for the Distance
This is the part that quietly determines whether your event day goes well, regardless of how strong your legs feel.
A reasonable target for most riders is somewhere in the 60-90 grams of carbohydrate per hour range once you’re riding for more than an hour or two — and that number is trainable. If you’ve never eaten that much on the bike before, your gut needs practice just like your legs do. Don’t try a new fuelling strategy for the first time on race day.
Start eating in the first 30 minutes of your ride, not when you first feel hungry. By the time hunger shows up, you’re already behind, and it’s much harder to dig yourself out of an energy deficit mid-ride than to stay ahead of it. Hydration and electrolytes matter just as much, especially on a warm event day — don’t let fuelling become “just gels” and forget the fluids.
If you want to understand why under-fuelling causes bigger problems than just a bad ride, I’ve written about what happens when your body doesn’t get enough fuel — it applies just as much to a single long ride as it does to a whole training block.
Pacing Your Event Day
Set a ceiling for yourself on the first climb of the day and stick to it, no matter who’s riding away from you. The riders who attack early are, more often than not, the ones you’ll pass in the final hour.
If you’re riding by feel rather than a power meter — which is genuinely fine, and how most gran fondo riders actually train — aim to keep your effort at something you could sustain a conversation through for the first half of the ride. If you’re breathing too hard to talk, you’re going out too hot.
Check in with yourself in the final third: if your effort feels harder than it should for the pace you’re holding, that’s your body telling you to back off, eat something, and drink. Ignoring that signal is how good rides fall apart in the last hour.
What I Wish I’d Known Before My First Fondo
The biggest lesson from my own events — BC Bike Race, the Petite Fondo, Snow to Surf, the Ride to Conquer Cancer — wasn’t about watts or intervals. It was that the ride goes so much better when you respect the distance instead of trying to prove something in the first hour.
I also wish I’d trusted my fuelling plan more and my legs less. The instinct on race day is always to go a little harder than training told you to, because you feel good and the adrenaline is real. That’s exactly the moment to hold back. The version of you at hour four will thank the version of you at hour one for being patient.
FAQ
How many hours a week do I need to train for a gran fondo?
Most amateur riders do well training somewhere in the 6-10 hour range per week in the months leading up to the event, with your long ride making up a big share of that. More volume helps, but consistency and a solid long ride matter more than chasing a high weekly number.
What should I eat during a gran fondo?
Aim for roughly 60-90 grams of carbohydrate per hour once you’re more than an hour or two in, alongside steady fluids and electrolytes. Practice this exact routine on your long training rides so nothing about it is new on event day.
How do I pace a gran fondo without a power meter?
Use perceived effort and your breathing as your guide. You should be able to hold a conversation for most of the first half of the ride — if you can’t, you’re going out too hard. Set a personal ceiling for the first climb and don’t let group pressure push you past it.
Ready to Build Your Plan
A gran fondo rewards patience more than raw fitness. Build your aerobic base honestly, practice your fuelling before race day arrives, and pace the first hour like you mean to still be riding well in the fifth. That’s the whole plan, really — everything else is detail.
If you’re working on your own build, have a look through the Training and Nutrition archives on my site. It’s all free, and it’s all things I’ve actually used myself.