# Running Races in Boulder, CO (2026)

> 7 upcoming races in and around Boulder, Colorado.

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

## Races

- **[Mountain Lions XC Program](https://runthis.run/event/rs-146100-mountain-lions-xc-program)** — Mon, Sep 21, 2026 · 12:00 AM UTC · Boulder, CO
- **[Running for Children's Rights to Both Parents - 9 of 50 Half Marathons in 50 States - Colorado](https://runthis.run/event/rs-205779-running-for-childrens-rights-to-both-parents-9-of-50-half-ma)** — Sun, Sep 27, 2026 · 12:00 AM UTC · Boulder, CO · Marathon / 5K / 10K
- **[Girls on the Run Rockies Boulderthon SoleMates 2026](https://runthis.run/event/rs-211392-girls-on-the-run-rockies-boulderthon-solemates-2026)** — Sun, Sep 27, 2026 · 12:00 AM UTC · Boulder, CO · Marathon / 10K
- **[Alpine Bank Boulder Thanksgiving Day 5K](https://runthis.run/event/rs-146873-alpine-bank-boulder-thanksgiving-day-5k)** — Thu, Nov 26, 2026 · 12:00 AM UTC · Boulder, CO · 5K / 800 m
- **[Hands & Voices New Year Virtual 5K: Trails to the Summit](https://runthis.run/event/rs-117629-hands-voices-new-year-virtual-5k-trails-to-the-summit)** — Thu, Dec 31, 2026 · 12:00 AM UTC · Boulder, CO · 5K
- **[Emerge 5K](https://runthis.run/event/rs-200762-emerge-5k)** — Sun, May 2, 2027 · 12:00 AM UTC · Boulder, CO · 5K
- **[Alpha 5K Challenge](https://runthis.run/event/rs-213662-alpha-5k-challenge)** — Sat, Jun 12, 2027 · 12:00 AM UTC · Boulder, CO · 5K

## Races by distance in Boulder

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

---

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