Upcoming Races in Thornton

Endurance Grid lists 9 races in Thornton, Colorado, from August 2026 to June 2027.

9
Upcoming races
1
Sports covered

Host City

About Thornton, CO

Population

142,878

as of 2023

City Elevation

5,347 ft

Nearest Airport

DEN

Denver International Airport

Time Zone

Mountain Time

Races in Thornton, CO

Explore and filter upcoming endurance races in Thornton, Colorado on the map below — by sport, distance, price, or month.

9 races in Thornton

August 2026 Thornton, Colorado Races

2 upcoming races in Thornton, Colorado in August.
Aug
8
Sat
Running
Summer Sizzler- Denver
Carpenter Park/Thornton Recreation Center Park, Thornton, CO
1 Mile · 5K · 10K · Other
Avg 90° / 59°·5,347 ft city elevation
Aug–Sep
30–27
Sun–Sun
Running
RMRR Fall Marathon Training Series
Riverdale Ballfields in Thornton, Thornton, CO
10 Mile · Other
Avg 88° / 56°·5,347 ft city elevation

September 2026 Thornton, Colorado Races

3 upcoming races in Thornton, Colorado in September.
Sep
13
Sun
Running
RMRR September 5k/10k
9830 Riverdale Road, Thornton, CO
5K · 10K
Avg 83° / 50°·5,347 ft city elevation
Sep
13
Sun
Running
RMRR Fall Marathon Training Series #2
Riverdale Ballfields in Thornton, Thornton, CO
Other
Avg 83° / 50°·5,347 ft city elevation
Sep
27
Sun
Running
RMRR Fall Marathon Training Series #3
Riverdale Ballfields in Thornton, Thornton, CO
10 Mile · Other
Avg 76° / 44°·5,347 ft city elevation

October 2026 Thornton, Colorado Races

2 upcoming races in Thornton, Colorado in October.
Oct
3
Sat
Running
I Can 5k
Carpenter Park Fields, Thornton, CO
5K
Avg 73° / 42°·5,347 ft city elevation
Oct
31
Sat
Running
I Ain't Scared (of 5k)
Colorado and 108th Ave, Thornton, CO
5K · Other
Avg 61° / 32°·5,347 ft city elevation

December 2026 Thornton, Colorado Races

1 upcoming race in Thornton, Colorado in December.
Dec
12
Sat
Running
WinterFest 5k & Fun Run
3498 E 112th Ave, Thornton, CO
5K
Avg 47° / 19°·5,347 ft city elevation

June 2027 Thornton, Colorado Races

1 upcoming race in Thornton, Colorado in June.
Jun
19
Sat
Running
Unicorn 5k (North)
E 108th Ave & Colorado Blvd, Thornton, CO
1K · 5K
Avg 87° / 55°·5,347 ft city elevation

Just Outside Thornton

Races near Thornton

All-Out Fa La La
Sat, Dec 5
10170 Church Ranch Way, Westminster, CO
4 mi away
Candy Cane Course - Denver
Sun, Dec 6
Westfield Village Park, Westminster, CO
4 mi away
Erin Go Bragh 7.77k
Sat, Mar 13
10600 Westminster Blvd, Westminster, CO
4 mi away
All-Out Beat the Heat
Sat, Apr 24
10170 Church Ranch Way, Westminster, CO
4 mi away
Jog in the Bog 5k
Sat, Aug 22
3645 W 112th ave, Westminster, CO
4 mi away
NIGHT NATION RUN - DENVER
Sat, Sep 26
DICK'S SPORTING GOODS PARK, Commerce City, CO
4 mi away
Pioneer Prairie Dog Half, 10k & 5k
Sun, Aug 23
10600 Westminster Blvd, Westminster, CO
5 mi away
Westy Half & 5k
Sun, Oct 11
10600 Westminster Blvd, Westminster, CO
5 mi away
Colorado Women's Classic - Westminster
Sun, May 9
10600 Westminster Blvd, Westminster, CO
5 mi away
All-Out Dog Days
Sat, Jul 11
10170 Church Ranch Way, Westminster, CO
6 mi away
All-Out Fall Fest
Sat, Sep 19
10170 Church Ranch Way, Westminster, CO
6 mi away
Golden Harvest Half Marathon & 5k/10k - Denver
Sat, Sep 5
Parking Lot South of The Westin Westminster, Westminster, CO
6 mi away

Frequently Asked Questions (FAQs)

How many races are in Thornton, Colorado?+
Endurance Grid's Race Calendar lists 9 upcoming races in Thornton, Colorado, spanning 1 sport.
What kinds of races are held in Thornton?+
Thornton hosts running races.
Is there a race season in Thornton?+
Races in Thornton run throughout the year rather than in a single fixed season. Of the upcoming races on Endurance Grid's Race Calendar, the most are in September and August.
What race distances can you find in Thornton?+
Upcoming races in Thornton cover distances including 1K, 1 Mile, 5K, 10K, and 10 Mile.
What other cities near Thornton have races?+
Nearby race cities include Westminster.