Atomic Days Blast Off Fun Run
About this race
The 26th Annual Atomic Days Blast Off Fun Run is a community celebration event held in Arco, Idaho to kick off the Atomic Days festivities. It’s designed for all ages and fitness levels, offering a fun, family-friendly atmosphere with multiple race options.
Pick your distance
Running
10K Run
An easy outdoor 10 kilometer paved and improved unpaved course taking runners through downtown Arco Idaho to the west of town through gentle hills that showcase farmland and high desert.
5K Run
An easy, historic 5 kilometer run over paved and improved unpaved city streets taking runners through downtown Arco Idaho and along the base of Arco Peak and the Number Hill.
Kids 1 Mile
A quick blast through the streets of Arco, Idaho along a 1 mile loop for our younger runners.
Walking
5K Walk
An easy, historic 5 kilometer walk over paved and improved unpaved city streets taking runners through downtown Arco Idaho and along the base of Arco Peak and the Number Hill.
Typical race-day weather
Based on 1 year of Open-Meteo archive data for this event's race dates in Arco, plus the 3 days either side.
The sun rises at 6:08 AM and sets at 9:10 PM local time (MDT) in Arco on July 18, 2026 — 15h 01m of daylight.
Course
No course map published yet.
The organizer hasn't released a route for this event, and we don't publish guesses. If you're the organizer, send us a GPX file and we'll draw the profile.
Reviews
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Where this page comes from. Race details were last updated on . We re-check listings regularly and again in the week before race day.
- Entries, prices, waves and inclusions — the event's official registration page
- Temperature and humidity — Copernicus ERA5 reanalysis via Open-Meteo (CC BY 4.0)
- Elevation and terrain relief — Copernicus DEM GLO-90, ESA (CC BY 4.0)
- Comparisons and counts — Race Discovery calendar, 1 Arco event
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