Platte River Half-Marathon, Relay & 5k
The Platte River Half-Marathon offers a fast, flat course with a lively post-race celebration.
Race Date
Apr 11, 2027
Location
Littleton, CO
Quick facts
- Date
- Sunday, April 11, 2027
- Location
- Littleton, Colorado
- Distance
- Half marathon (13.1 mi) + 13.1 Miles, 5K, 3.1 Miles
- Course
- Out & Back
- Terrain
- Road
- USATF certified
- Not listed
- Finishers on record
- 20,529
Highlights
Good For
Atmosphere
Course
The Experience
The Platte River Half-Marathon, now in its 19th year, draws runners from about 23 states to Littleton, Colorado, for a well-organized event with a steady field size of around 641 finishers. A quarter of participants return, a testament to the race's appeal.
The course is predominantly a paved out-and-back along the scenic Platte River Trail, featuring a slight downhill on the outbound leg and a gentle incline returning, with a brief uphill over an overpass near the finish. This profile, combined with minimal elevation change, makes it a potentially fast course for setting personal bests.
Post-race festivities are a highlight, with an epic party at the adjacent Breckenridge Brewery, complete with food, vendors, live music, and beer. The event also supports Salute Colorado, adding a charitable element to the day's adrenaline-pumping running and fun.
Race-provided description
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! Whether you’re an experienced runner looking to set a new PR, a newcomer looking to tackle your first half-marathon, or a team of runners wanting to run an exciting relay race, join us for a day of adrenaline-pumping running, scenic views, and all-around fun. What’s more, we donate a portion of the proceeds to Salute Colorado. Thank you for your support, and we can’t wait to see you at the finish line! Questions? Visit our race website here. Entry fees are non-refundable and non-transferable. There are no deferrals to future years.
Logistics
Race Day
Sunday, April 11, 2027
Start Time
7:00 AM
Giveaway
Long Sleeve Tech T-Shirt
Start Location
6745 S. Santa Fe Dr., Littleton, CO, 80120
Course Info
Course Type
Out & Back
Terrain
road
Scenery
Lake River
Surface
Paved
Difficulty
Ultra-Flat
Net Drop/km
0 m (Flat)
Separation
0.0%
Also Offers
Course Map
Quality Score
Runner Favorite8919 years running
~994 finishers a year
growing or steady
25% returning runners
5 timing sources · 5 photos
runners from 23 states
winner 1:09:20
typical high 65°F
Race Day Weather
5-year historical avgStart (Low)
35°
Afternoon (High)
65°
Pleasant conditions — light layers at start, comfortable by finish
0.0"
Precipitation
12 mph
Wind
38%
Humidity
Historical Finish Times
How 20,529 finishers actually crossed the line across 19 years.
Most recent
2026
Total finishers
20,529
Median time
2:07:06
Latest turnout
635
States
47
Turnout by year
2018–2026
Hover the histogram to inspect specific finish times.
Race Photos
Frequently asked
When is the Platte River Half-Marathon, Relay & 5k?
The Platte River Half-Marathon, Relay & 5k is held on Sunday, April 11, 2027, starting at 7:00 AM.
Where does the Platte River Half-Marathon, Relay & 5k take place?
It takes place in Littleton, Colorado.
What distances does the Platte River Half-Marathon, Relay & 5k offer?
The half marathon (13.1 miles), plus 13.1 Miles, 5K, 3.1 Miles.
Is the Platte River Half-Marathon, Relay & 5k course flat and good for a PR?
The Platte River Half-Marathon, Relay & 5k is a ultra-flat, out & back course.
How many people run the Platte River Half-Marathon, Relay & 5k?
HalfRuns has finish records for 20,529 runners who have completed the Platte River Half-Marathon, Relay & 5k.
HalfRuns editorial — independent, no paid placement.
Explore More Journeys
Can't make it to Littleton? Discover other experiences that match your running style.
Search All Races
