Windsor Marathon, Half Marathon, 10k, 5k & 1 Mile Run 2026
- Date
- Sunday, October 4, 2026
- Start time
- 7:00 AM start (Denver)
- Location
- Windsor, Colorado
- Entry fee
- From $20
- 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 |
|---|---|---|---|---|
| Windsor Marathon | Marathon | Oct 4, 20267:00 AM | $140$154 after Sep 26, 2026 | – |
| Windsor Half Marathon | Half Marathon | Oct 4, 20268:00 AM | $105$115 after Sep 26, 2026 | – |
| 10K | 10K | Oct 4, 20268:30 AM | $75$80 after Sep 26, 2026 | – |
| 5K | 5K | Oct 4, 20268:45 AM | $59$70 after Sep 26, 2026 | – |
| 1 Mile Fit & Fun Run | Kids | Oct 4, 202610:00 AM | $20 | – |
Entry fees exclude processing fees. Prices and dates come from the race's registration page and refresh nightly.
Race day planning
Entry fee schedule
- Windsor Marathon: $154 until Oct 5.
- Windsor Half Marathon: $115 until Oct 5.
- 10K: $80 until Oct 5.
- 5K: $70 until Oct 5.
Online registration closes Oct 5, 2026, unless the race fills first.
How the price compares
At $140, entry is about 17 percent above a typical marathon in Colorado, which costs $120 right now.
What a typical finish looks like
A typical finisher at a marathon in Colorado runs 4:22:49, about 10:01 a mile, based on 6 races with published results. Women typically finish in 4:34:31 and men in 4:12:33.
Light and altitude
Sunrise on race morning is at about 6:57 AM, and the Windsor Marathon starts at 7:00 AM. The start sits about 4,790 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
The Island at Pelican Lakes in Water Valley, Windsor, CO 80550
The pin marks the address the race lists, which is usually the start. The organizers have not shared a course map with us yet.
2025 results
All results (5 years)5K
Windsor Half Marathon
10K
Aggregated from official results for Windsor Marathon, Half Marathon, 10k, 5k & 1 Mile Run. Individual finisher names are not stored here.
How fast do you need to be at Windsor Marathon, Half Marathon, 10k, 5k & 1 Mile Run?
At the 2025 5K, the fastest tenth finished in 27:26 or better, the top quarter in 31:57, and half the field in 37:55; the last tenth came in after 57:01.
At the 2025 Windsor Half Marathon, the fastest tenth finished in 1:40:04 or better, the top quarter in 1:56:02, and half the field in 2:08:24; the last tenth came in after 2:51:33.
At the 2025 10K, the fastest tenth finished in 52:01 or better, the top quarter in 58:50, and half the field in 1:05:01; the last tenth came in after 1:34:47.
| Age | Women | Men |
|---|---|---|
| Under 20 | 27:58 | 27:37 |
| 20-29 | 31:29 | 24:51 |
| 30-39 | 26:46 | 24:41 |
| 40-49 | 30:03 | 28:12 |
| 50-59 | 36:51 | 31:01 |
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 2025.
Finishers by year
Up 44 percent since 2021.
All events combined, from official results.
Windsor Marathon, Half Marathon, 10k, 5k & 1 Mile Run 5K year by year
From 2021 to 2025, the field went from 114 to 212 finishers, and the median time rose from 36:37 to 37:55.
| Year | Finishers | Median | Fastest tenth | Winner |
|---|---|---|---|---|
| 2025 | 212 (+89%) | 37:55 | under 27:26 | 19:58 |
| 2024 | 112 (-21%) | 39:27 | under 28:36 | 20:15 |
| 2023 | 141 (-24%) | 38:54 | under 26:40 | 21:32 |
| 2022 | 185 (+62%) | 37:03 | under 26:41 | 19:43 |
| 2021 | 114 | 36:37 | under 26:59 | 19:14 |
From each year's official results for the 5K; virtual options are left out.
How fast is it?
Slower than most Colorado 5Ks
The fastest quarter of the 2025 5K field finished under 31:57, against 29:37 in a typical Colorado 5K, so times here run 8 percent slower.
- Half Marathon: About average for Colorado half marathons. The fastest quarter of the 2025 half marathon field finished under 1:56:02, against 1:56:43 in a typical Colorado half marathon, so times here are about average.
- 10K: Slower than most Colorado 10Ks. The fastest quarter of the 2025 10K field finished under 58:50, against 55:16 in a typical Colorado 10K, so times here run 6 percent slower.
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 October 4 the day usually runs from 48°F at dawn to 77°F in the afternoon, with measurable rain on about 8% of days. Cold snaps dip to 42°F and hot years reach 85°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
- The Island at Pelican Lakes in Water Valley, Windsor, CO 80550Map
- Course
- Road
- Start elevation
- About 4,790 feet
- Included with entry
- Long Sleeve Shirt; Long sleeve shirt
- Donations
- Accepted when you register
- Distances
- 5K, 10K, Half Marathon, Marathon, Kids
- Editions
- 2026 (Oct 4, 2026), 2025 (Oct 5, 2025), 2024 (Oct 6, 2024), 2023 (Oct 8, 2023), 2022 (Oct 9, 2022), 2021 (Oct 10, 2021)
Organize this race? Add details or a correction
Plan your race
Quick answers
- When is Windsor Marathon, Half Marathon, 10k, 5k & 1 Mile Run?
- Sunday, October 4, 2026, starting at 7:00 AM.
- How much does it cost?
- Entry starts at $20 before processing fees.
- When does registration close?
- Online registration closes Oct 5, 2026, unless the race fills first.
- Is the entry fee high for Colorado?
- At $140, entry is about 17 percent above a typical marathon in Colorado, which costs $120 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, 10K, Half Marathon, Marathon, Kids.
- How big is it, and how fast?
- In 2025, 212 runners finished the 5K; the median finish was 37:55 and the winner ran 19:58.
- Is it a fast course?
- The fastest quarter of the 2025 5K field finished under 31:57, against 29:37 in a typical Colorado 5K, so times here run 8 percent slower.
- Where does it start?
- The Island at Pelican Lakes in Water Valley, Windsor, CO 80550.
From the organizers
Welcome to the Windsor Marathon. This event starts and ends at The Island at Pelican Lakes in Water Valley, with a great after party including breakfast, drinks and music. Tour beautiful Windsor on a variety of terrain, through golf courses, along the Poudre River trail, up and down hills, and event single track dirt trails for the marathon.
There's a distance for everyone with a kids fun run, 5k, 10k, half and full marathon. This year's races benefits Banner MD Anderson Cancer Center and the Weld RE-4 Foundation. Create a team and let's show our strength in numbers!