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Best Fall Marathons in the US: Where the 2026 Season Actually Is

Fall is marathon season and the numbers are lopsided: of the 253 marathons on our calendar, 106 fall in September, October, and November — 32, 38, and 36 respectively — while June musters four. Cool air, summer fitness, and a century of scheduling tradition all point at the same three months. Here's how to pick one and when to commit.

The season, by the numbers

  • October — 38 marathons. The peak, and the month with the best odds of racing in the 45–55°F sweet spot.
  • November — 36. Late-season depth: cooler still, and the month that catches anyone whose summer training started late.
  • September — 32. The season opener; hotter risk, but a natural target if you built through spring.
  • December–January — 58 combined. The overlooked window; warm-weather destinations do their marathons when the north freezes.
  • June — 4. The trough. If someone offers you a June marathon, ask about the start time.

How to choose your fall marathon

  1. Start with the date, not the race. Count 16–20 weeks back from candidate race days. Whichever races leave you a training block you can actually run are your real options.
  2. Match the course to your goal. Chasing a time? Flat, certified, pace groups, big field (see what makes a Boston qualifier). Chasing the experience? Pick the city you want to spend a weekend in.
  3. Check the weather history, not the average. An early September marathon in the South can be 78°F at the gun. Our heat guide explains what that costs you.
  4. Book the tune-ups at the same time. A 10K three to four weeks out is the single best predictor of your marathon pace — the tune-up schedule scales to the marathon build.
  5. Register during the early window. Marquee fall marathons fill on caps; the rest get more expensive at each posted price tier.

What “best” actually means

Every “best fall marathons” list is really three lists. There are the famous ones — huge fields, closed streets, crowds five deep, and registration systems that treat you like a lottery ticket. There are the fast ones — flat certified courses with deep pace groups where people go hunting for qualifiers. And there are the good ones — regional marathons with 400 finishers, volunteers who know your name by mile 20, and a finish-line pancake breakfast. Most first-time marathoners are happier at the third kind and sign up for the first.

Find yours

Rather than publish a subjective top-ten, we list every marathon on real dates in real cities: open your metro’s calendar and filter to marathon, or browse the month pages — October is where the season lives. Then set your splits and start the block.

Quick answers

When is fall marathon season?

September through November, peaking in October. Our calendar lists 106 marathons in that window — 32 in September, 38 in October, and 36 in November — against a yearly total of 253. Cool morning temperatures and a full summer of training behind you are why the season clusters there.

When should I register for a fall marathon?

Six to nine months out for marquee races that fill on entry caps, and before the early-bird deadline for everything else. Registration for the biggest fall marathons often opens the winter prior; smaller regional marathons stay open into late summer but get more expensive at each price tier.

How long do I need to train for a fall marathon?

16-20 weeks from a solid base of regular running, which means starting in May or June for an October race. If you're building from a 10K or half-marathon base, count backwards from race day and be honest about the starting point.

Published 2026-07-21 · RunFinders