From the Organizer
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.
Events
Weather
It's too far out for a forecast, so here's what weather on this date is normally like in the area. A race day forecast will replace this as race week approaches.
Typical High
88°
Typical Low
52°
Chance of Rain
8%
Based on US Climate Normals data from Arco, 1 mi from the venue.
Host City
Elevation
5,325 ft
Nearest Airport
SUN
Friedman Memorial Airport · 50 mi
Major Hub
BOI
Boise Air Terminal/Gowen Field · 145 mi
Time Zone
Mountain Time
From Endurance Grid
Line up lodging and travel early to lock in your race weekend.
Race Location
Your Next Start Line
Every finish line starts with a single decision. Claim your spot at 26th Atomic Days Blast Off Fun Run, put it on the calendar, and turn “someday” into a start date.
Coming Up
RMHC's Family Fun Run and Carnival
67 miles away
To Bone and Back Relay
67 miles away
Anytime Fitness Rigby Lake Run
71 miles away
Idaho Falls FireKracker 5k
67 miles away
From Endurance Grid
Endurance Grid is here to help you understand the sport, decide if it's the right fit, and learn how to prepare. For course distances, logistics, and race-day specifics, always defer to the race organizer's event page.
With running, there's a distance for every fitness level, a community at every start line, and nothing beats the feeling of crossing a finish line you trained for.
Running is an endurance sport that rewards consistency, and showing up every week compounds in ways that will surprise you.
From 5K to marathon, running races are the most accessible entry point into endurance sport. There's a distance for every fitness level and a community at every start line.
Frequently Asked Questions (FAQs)
26th Atomic Days Blast Off Fun Run
Jul 18, 2026