Heatwave Half Marathon/5K/10K - St. Louis 2027
- Date
- Saturday, July 31, 2027
- Start time
- 7:00 AM start (Chicago)
- Location
- St. Louis, Missouri
- Entry fee
- From Free · goes up to $36 on Apr 27, 2027
- Included with entry
- Includes a shirt
- Fundraising
- Takes optional donations when you register
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Events and entry fees
| Event | Distance | When | Entry fee | Cap |
|---|---|---|---|---|
| 10K | 10K | Jul 31, 20277:00 AM | $32$36 after Apr 27, 2027 | – |
| 1 Mile | 1 Mile | Jul 31, 20277:00 AM | $22 | – |
| 5K | 5K | Jul 31, 20277:00 AM | $32$36 after Apr 27, 2027 | – |
| Half-Marathon | Half Marathon | Jul 31, 20277:00 AM | $50$56 after Feb 2, 2027 | – |
| Kids Dash | Kids | Jul 31, 20277:00 AM | $17 | – |
| Running Buddy Half Marathon | Half Marathon | Jul 31, 20277:00 AM | Free | – |
| Volunteer Then Run | – | Jul 31, 20277:00 AM | $17 | 5 |
| Virtual RaceVirtual | – | Jul 31, 20277:00 AM | $42 | – |
Entry fees exclude processing fees. Prices and dates come from the race's registration page and refresh nightly.
Race day planning
Entry fee schedule
- 10K and 5K: $32 until Apr 27, then $36 until Jun 7, then $40 until Jul 12, then $44 until Jul 30, then $48 until Jul 31.
- 1 Mile: $22 until Jul 31.
- Half-Marathon: $50 until Feb 2, then $56 until Apr 5, then $62 until Jun 7, then $68 until Jul 12, then $74 until Jul 29, then $80 until Jul 31.
- Kids Dash: $17 until Jul 31.
Online registration closes Jul 31, 2027, unless the race fills first.
How the price compares
At $50, entry is about 23 percent below a typical half marathon in Missouri, which costs $65 right now.
What a typical finish looks like
A typical finisher at a half marathon in St. Louis runs 2:11:29, about 10:02 a mile, based on 6 races with published results. Women typically finish in 2:19:26 and men in 1:59:59.
Light and altitude
Sunrise on race morning is at about 6:01 AM, and the 10K starts at 7:00 AM. The start sits about 570 feet above sea level.
Fees exclude processing fees. Comparisons use current entry fees and published results from races nearby.
Start location and course
TBD, St. Louis, MO 63123
The pin marks the address the race lists, which is usually the start. The organizers have not shared a course map with us yet.
2026 results
All resultsHalf-Marathon
5 K
10 K
Aggregated from official results for Heatwave Half Marathon/5K/10K - St. Louis. Individual finisher names are not stored here.
How fast do you need to be at Heatwave Half Marathon/5K/10K - St. Louis?
At the 2026 Half-Marathon, the fastest tenth finished in 1:42:57 or better, the top quarter in 1:53:28, and half the field in 2:12:49; the last tenth came in after 2:41:58.
At the 2026 5 K, the fastest tenth finished in 27:57 or better, the top quarter in 30:32, and half the field in 36:13; the last tenth came in after 54:34.
At the 2026 10 K, the fastest tenth finished in 48:43 or better, the top quarter in 54:45, and half the field in 59:50; the last tenth came in after 1:24:54.
| Age | Women | Men |
|---|---|---|
| Under 20 | 1:52:44 | 1:44:27 |
| 20-29 | 1:55:04 | 1:45:31 |
| 30-39 | 1:51:32 | 1:40:14 |
| 40-49 | 2:21:52 | 1:55:55 |
| 50-59 | 2:23:31 | n/a |
Groups with fewer than five finishers are left out. Awards vary by race; check the race's rules.
What would my time get me?
Where a finish time would have placed in 2026.
How fast is it?
Faster than most Missouri half marathons
The fastest quarter of the 2026 half marathon field finished under 1:53:28, against 1:57:25 in a typical Missouri half marathon, so times here run 3 percent faster.
- 5K: About average for Missouri 5Ks. The fastest quarter of the 2026 5K field finished under 30:32, against 29:53 in a typical Missouri 5K, so times here are about average.
- 10K: Faster than most Missouri 10Ks. The fastest quarter of the 2026 10K field finished under 54:45, against 56:28 in a typical Missouri 10K, so times here run 3 percent faster.
Compares the fastest quarter of each field, so walkers and first-timers do not skew it. It reflects the course and the field together: a flat course, cool weather, or a competitive crowd all make times faster.
Typical race-day weather
Around July 31 the day usually runs from 71°F at dawn to 88°F in the afternoon, with measurable rain on about 33% of days. Cold snaps dip to 66°F and hot years reach 96°F.
Based on 75 days within a week of the date over the last 5 years, from historical weather for the start area. Not a forecast.
Race details
- Where
- TBD, St. Louis, MO 63123Map
- Course
- Road
- Start elevation
- About 570 feet
- Included with entry
- Tank Top; T-Shirt
- Donations
- Accepted when you register
- Distances
- 1 Mile, 5K, 10K, Half Marathon, Kids
- Editions
- 2027 (Jul 31, 2027), 2026 (Aug 1, 2026)
Organize this race? Add details or a correction
Plan your race
Quick answers
- When is Heatwave Half Marathon/5K/10K - St. Louis?
- Saturday, July 31, 2027, starting at 7:00 AM.
- How much does it cost?
- Entry starts at Free before processing fees, and rises to $36 on Apr 27, 2027.
- When does registration close?
- Online registration closes Jul 31, 2027, unless the race fills first.
- Is the entry fee high for Missouri?
- At $50, entry is about 23 percent below a typical half marathon in Missouri, which costs $65 right now.
- Do runners get a shirt or medal?
- Entry includes a shirt, according to the race's registration page. Check it for sizes and whether kids' races get the same.
- Can I donate to a cause when I register?
- Yes. The registration form offers an optional donation, usually for the charity or nonprofit the race supports. The race's own page names the cause.
- What distances can I run?
- 1 Mile, 5K, 10K, Half Marathon, Kids.
- How big is it, and how fast?
- In 2026, 135 runners finished the Half-Marathon; the median finish was 2:12:49 and the winner ran 1:29:17.
- Is it a fast course?
- The fastest quarter of the 2026 half marathon field finished under 1:53:28, against 1:57:25 in a typical Missouri half marathon, so times here run 3 percent faster.
- Where does it start?
- TBD, St. Louis, MO 63123.
From the organizers
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
Plenty of hot fun in the summer sun!
Grab your friends and family—you won’t want to miss this one!
Can’t make the race? No problem! We offer a virtual race option where you can run anywhere, at any time, and still earn the fun swag!
Youth-based pricing is available: ages 12 & under are only $17!