Platte River Half-Marathon, Relay & 5k 2027
- Date
- Sunday, April 11, 2027
- Start time
- 7:00 AM start (Denver)
- Location
- Littleton, Colorado
- Entry fee
- From $45 · goes up to $90 on Nov 1, 2026
- Included with entry
- Includes a shirt
- Fundraising
- Takes optional donations when you register
Registration is open.
We earn a small commission when you register through this link, at no cost to you. Details
Official race websiteAdd to calendar: Apple or Outlook · Google
Events and entry fees
| Event | Distance | When | Entry fee | Cap |
|---|---|---|---|---|
| Half Marathon | Half Marathon | Apr 11, 20277:00 AM | $80$90 after Nov 1, 2026 | – |
| Half Marathon Relay | Relay | Apr 11, 20277:00 AM | $175$195 after Nov 1, 2026 | – |
| 5k | 5K | Apr 11, 20277:15 AM | $45$50 after Nov 1, 2026 | – |
Entry fees exclude processing fees. Prices and dates come from the race's registration page and refresh nightly.
The Half Marathon fee goes up to $90 on Nov 1, 2026.
Race day planning
Entry fee schedule
- Half Marathon: $80 until Nov 1, then $90 until Jan 1, then $100 until Mar 1, then $110 until Apr 8, then $125 until Apr 11.
- Half Marathon Relay: $175 until Nov 1, then $195 until Jan 1, then $215 until Mar 1, then $235 until Apr 8, then $255 until Apr 11.
- 5k: $45 until Nov 1, then $50 until Jan 1, then $55 until Mar 1, then $60 until Apr 8, then $65 until Apr 11.
Online registration closes Apr 11, 2027, unless the race fills first.
How the price compares
At $80, entry is about 33 percent above a typical half marathon in Colorado, which costs $60 right now.
What a typical finish looks like
A typical finisher at a half marathon in Colorado runs 2:12:38, about 10:07 a mile, based on 60 races with published results. Women typically finish in 2:19:55 and men in 2:03:31.
Light and altitude
Sunrise on race morning is at about 6:30 AM, and the Half Marathon starts at 7:00 AM. The start sits about 5,430 feet above sea level, high enough that most runners from lower ground run noticeably slower.
Fees exclude processing fees. Comparisons use current entry fees and published results from races nearby.
Start location and course
6745 S. Santa Fe Dr., Littleton, CO 80120
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 results (2 years)Half Marathon
5k
Half Marathon Relay
Aggregated from official results (Bighorn Racing) for Platte River Half-Marathon, Relay & 5k. Individual finisher names are not stored here.
How fast do you need to be at Platte River Half-Marathon, Relay & 5k?
At the 2026 Half Marathon, the fastest tenth finished in 1:40:46 or better, the top quarter in 1:52:19, and half the field in 2:07:06; the last tenth came in after 2:43:44.
At the 2026 5k, the fastest tenth finished in 24:37 or better, the top quarter in 27:36, and half the field in 30:48; the last tenth came in after 43:45.
At the 2026 Half Marathon Relay, the fastest tenth finished in 1:44:44 or better, the top quarter in 1:58:22, and half the field in 2:11:39; the last tenth came in after 2:37:56.
| Age | Women | Men |
|---|---|---|
| 20-29 | 1:28:46 | 1:27:28 |
| 30-39 | 1:40:49 | 1:15:58 |
| 40-49 | 1:39:00 | 1:23:30 |
| 50-59 | 1:52:48 | 1:38:58 |
| 60-69 | 2:07:52 | 1:51:07 |
| 70+ | n/a | 1:55:04 |
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.
Finishers by year
Up 54 percent since 2025.
All events combined, from official results.
Platte River Half-Marathon, Relay & 5k Half Marathon year by year
From 2025 to 2026, the field went from 503 to 641 finishers, and the median time rose from 2:04:04 to 2:07:06.
| Year | Finishers | Median | Fastest tenth | Winner |
|---|---|---|---|---|
| 2026 | 641 (+27%) | 2:07:06 | under 1:40:46 | 1:09:21 |
| 2025 | 503 | 2:04:04 | under 1:38:27 | 1:09:10 |
From each year's official results for the Half Marathon; virtual options are left out.
How fast is it?
Faster than most Colorado half marathons
The fastest quarter of the 2026 half marathon field finished under 1:52:19, against 1:56:43 in a typical Colorado half marathon, so times here run 4 percent faster.
- 5K: Faster than most Colorado 5Ks. The fastest quarter of the 2026 5K field finished under 27:36, against 29:37 in a typical Colorado 5K, so times here run 7 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 April 11 the day usually runs from 33°F at dawn to 66°F in the afternoon, with measurable rain on about 8% of days. Cold snaps dip to 23°F and hot years reach 76°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
- 6745 S. Santa Fe Dr., Littleton, CO 80120Map
- Course
- Road
- Start elevation
- About 5,430 feet
- Included with entry
- Long Sleeve Tech T-Shirt; Long Sleeve Tech Shirt
- Donations
- Accepted when you register
- Distances
- 5K, Half Marathon, Relay
- Editions
- 2027 (Apr 11, 2027), 2026 (Apr 7, 2026), 2025 (Apr 13, 2025), 2024 (Apr 14, 2024), 2023 (Apr 2, 2023), 2022 (Apr 10, 2022)
Organize this race? Add details or a correction
Plan your race
Quick answers
- When is Platte River Half-Marathon, Relay & 5k?
- Sunday, April 11, 2027, starting at 7:00 AM.
- How much does it cost?
- Entry starts at $45 before processing fees, and rises to $90 on Nov 1, 2026.
- When does registration close?
- Online registration closes Apr 11, 2027, unless the race fills first.
- Is the entry fee high for Colorado?
- At $80, entry is about 33 percent above a typical half marathon in Colorado, which costs $60 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?
- 5K, Half Marathon, Relay.
- How big is it, and how fast?
- In 2026, 641 runners finished the Half Marathon; the median finish was 2:07:06 and the winner ran 1:09:21.
- Is it a fast course?
- The fastest quarter of the 2026 half marathon field finished under 1:52:19, against 1:56:43 in a typical Colorado half marathon, so times here run 4 percent faster.
- Where does it start?
- 6745 S. Santa Fe Dr., Littleton, CO 80120.
From the organizers
Welcome to the Platte River Half Marathon, Relay & 5k race, one of the most exciting and popular races in the Denver Metro Area! This race is held annually in Littleton, CO. We’re thrilled to announce that registration for our upcoming 2027 event on Sunday, April 11th is open for the half-marathon and relay race. The race starts and finishes next to the beautiful Platte River Trail and adjacent to the popular Breckenridge Brewery campus. Join us for an epic post-race party at the Brewery with food, vendors, live music, and of course beer!