Heatwave Half Marathon/5K/10K - St. Louis
Updated
Saturday, July 31, 2027, first start 7:00 AM, in St. Louis (TBD). Distances: 1 mile, 5K, 10K, Half marathon. Entry from $22 to $50; the Half marathon goes from $50 to $56 after February 2.
Course and race notes
Join us for the Heatwave Half Marathon, 10K, & 5K!
A sun-soaked summer challenge that’s perfect for the whole family. The fun includes -. Great Swag - designer shirt & custom medal. Chip-timing with live results and awards. Free photos. FREE ice cream at the finish to help you cool off.
In the organizer's words, from the race's own listing.
Race details
Date
Saturday, July 31
2027 · in 266 days
Start time
7:00 AM
Earliest wave
Course
Road or path
Paved course
Distances
1 mile5K10KHalf marathon
Price
$22 to $50
Plus the platform's processing fee
Half marathon goes up after Tue Feb 2 (in 87 days)
Registration
Open
Online signup closes Sat Jul 31 (in 266 days)
Opened Oct 1, 2026
Race day in St. Louis
Weather
90° / 72°F
Typical high and low for July 31.
NOAA 1991–2020 climate normals, St Louis Sci Ctr, MO (6.5 mi away). Averages, not a forecast; a forecast appears here a week out.
Daylight
6:01 AM – 8:14 PM
Sunrise and sunset on Saturday. The first start is 59 minutes after sunrise.
Calculated for the race location.
Plan your trip
For the night before, Fri Jul 30
Where to stay
See all places to stay near St. Louis, MO ↗
Prices checked November 4, 2026 and can change. Confirm on the booking site before you book. We may earn a commission at no cost to you.
Trip cost
Add what you'll actually pay. It stays in this browser.
Total $0
Race entry starts at the lowest listed price, before the platform's fee.