# Running Races in Thornton, CO (2026)

> 9 upcoming races in and around Thornton, Colorado.

- **Page:** https://runthis.run/races/colorado/thornton

## Races

- **[Adams 12 MS XC](https://runthis.run/event/rs-135539-adams-12-ms-xc)** — Thu, Aug 27, 2026 · 12:00 AM UTC · Thornton, CO · 2.0 mi
- **[RMRR Fall Marathon Training Series](https://runthis.run/event/rs-104499-rmrr-fall-marathon-training-series)** — Sun, Aug 30, 2026 · 12:00 AM UTC · Thornton, CO · 10.0 mi / 20.0 mi
- **[RMRR Fall Marathon Training Series #2](https://runthis.run/event/rs-150894-rmrr-fall-marathon-training-series-2)** — Sun, Sep 13, 2026 · 12:00 AM UTC · Thornton, CO · 12.4 mi / 18.6 mi
- **[RMRR September 5k/10k](https://runthis.run/event/rs-97124-rmrr-september-5k-10k)** — Sun, Sep 13, 2026 · 12:00 AM UTC · Thornton, CO · 10K / 5K
- **[RMRR Fall Marathon Training Series #3](https://runthis.run/event/rs-150896-rmrr-fall-marathon-training-series-3)** — Sun, Sep 27, 2026 · 12:00 AM UTC · Thornton, CO · 10.0 mi / 20.0 mi
- **[I Can 5k](https://runthis.run/event/rs-79095-i-can-5k)** — Sat, Oct 3, 2026 · 12:00 AM UTC · Thornton, CO · 5K
- **[I Ain't Scared (of 5k)](https://runthis.run/event/rs-198388-i-aint-scared-of-5k)** — Sat, Oct 31, 2026 · 12:00 AM UTC · Thornton, CO · 5K
- **[WinterFest 5k & Fun Run](https://runthis.run/event/rs-135965-winterfest-5k-fun-run)** — Sat, Dec 12, 2026 · 12:00 AM UTC · Thornton, CO · 5K / 1200 m
- **[Unicorn 5k (North)](https://runthis.run/event/rs-109169-unicorn-5k-north)** — Sat, Jun 19, 2027 · 12:00 AM UTC · Thornton, CO · 5K / 1000 m

## Races by distance in Thornton

- [5K races in Thornton (5)](https://runthis.run/races/colorado/thornton/5k.md)

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Source: [https://runthis.run/races/colorado/thornton](https://runthis.run/races/colorado/thornton) — data from Run This (runthis.run).