Gravel base training is the foundation that every successful race season is built on. Before intervals, before race-specific work, before any intensity at all, you need a deep aerobic base — and the period between January and April is when that base gets built. Whether you’re targeting an early-season 50-miler or a late-summer 200, the training you do now will determine how well you hold up in the back half of your race. Here’s how to build it right.
What Is Base Training and Why Does It Matter?
Base training is sustained, low-intensity aerobic work — the kind of riding where you’re breathing comfortably, holding a conversation, and working at 60–70% of your maximum heart rate. It builds mitochondrial density, improves fat oxidation, and develops the capillary networks in your muscles that allow sustained effort at a relatively high percentage of your maximum capacity. Elite endurance athletes spend up to 80% of their training time in this zone.
Without base, intensity work produces fast but fragile fitness. Riders who skip straight to intervals often feel strong in the first half of long events and fall apart in the second — a hallmark of high top-end fitness without adequate aerobic foundation. For gravel racing specifically, where events last 4–12 hours, base fitness is the difference between finishing strong and surviving.
How Much Volume Do You Need?
Base training volume depends on your target event, your current fitness, and the time you have available. General guidelines: for a 50-mile race goal, build to 6–8 hours per week at peak. For a 100-mile race, 8–12 hours per week. For a 200-mile event like Unbound, 12–16 hours per week in the build phase. These are peak week targets — you’ll ramp up gradually over 8–12 weeks and include rest weeks every 3–4 weeks.
If you’re currently riding 3–4 hours per week, don’t jump to 10-hour weeks immediately. Add no more than 10% volume per week, and include a recovery week (40% volume reduction) every fourth week. Consistency over months matters far more than any single big week.
Zone 2 Training: The Engine Room
The majority of your base training should be in Zone 2 — the intensity zone where you’re working aerobically but not producing significant lactate. The classic test: you should be able to hold a full conversation without gasping, but you couldn’t sing. If you have a heart rate monitor, Zone 2 is roughly 60–70% of your maximum heart rate. If you have a power meter, it’s roughly 55–75% of FTP.
Zone 2 is harder to stay in than it sounds. Most riders naturally drift into Zone 3 (moderate intensity) when they feel comfortable — the pace feels too easy, they get distracted, or they respond to terrain by riding harder than necessary. Use a heart rate monitor or power meter to enforce the ceiling. Zone 2 only works if you actually stay in Zone 2.
Indoor vs. Outdoor Base Training
Early season base training often happens indoors, especially in northern climates where January and February roads are wet, dark, and potentially icy. Indoor training on a smart trainer is highly effective for Zone 2 work — you can hold a precise wattage, avoid traffic, and stack up training time efficiently. The downside: it’s mentally harder, and it doesn’t replicate the bike-handling and core demands of outdoor riding.
The ideal mix: 2–3 longer indoor sessions per week (60–120 minutes each) and one longer outdoor ride when weather permits. The outdoor ride should be your longest session of the week — 3–4 hours at base pace — and it should include terrain that mimics your target event. If you’re training for a mountainous race, include climbing. If your race is rolling gravel roads, ride rolling gravel roads.
When to Add Intensity
The mistake most self-coached gravel riders make is introducing intensity too early. Don’t add interval work until you’ve completed at least 6–8 weeks of consistent aerobic base. The physiological adaptations from base training take time — you can’t shortcut them. If you start intervals before your base is developed, you get tired faster, recover more slowly, and the intensity work doesn’t produce the gains it should.
A good signal that you’re ready to add intensity: your pace at Zone 2 heart rate has meaningfully improved over 6–8 weeks. You should be covering noticeably more ground at the same heart rate than you were when you started. That improvement — faster pace at the same aerobic effort — is evidence the base adaptations are happening. At that point, one sweet-spot or threshold session per week can be added alongside your continued Zone 2 work.
For a structured progression from base into race-specific training, see our full 12-week gravel race training plan. And when you’re ready to target a race, check the full race calendar for events at every distance.
Find your first (or next) race and start building toward it today. → Browse the Race Calendar
