Home / Denver & Boulder / October 2026

Races near Denver in October 2026

Updated October 17, 2026

21 races are on the calendar near Denver in October 2026, starting with Indian Creek Trail Runs on Saturday, October 17 in Sedalia. Listed by date, with prices and early-bird deadlines where the race publishes them.

Oct 2026Nov 2026Dec 2026Jan 2027Feb 2027Mar 2027Apr 2027May 2027Jun 2027Jul 2027Aug 2027Sep 2027

• Sat17Oct

  Indian Creek Trail Runs

  Sat Oct 17 · 8:00 AM · Sedalia · Denver Suburbs

  5.5 miles15 milesTrail

  from $60
• Sat17Oct

  Living Water 5K and Family Fun Walk/Jog

  Sat Oct 17 · 8:00 AM · Denver · Denver

  1 mile5K

  Reg. closed
• Sat17Oct

  Longmonster Dash 5k

  Sat Oct 17 · 8:30 AM · Longmont · Fort Collins & Loveland

  5K

  Reg. closed
• Sat17Oct

  Running Scared 5K/13K - Denver

  Sat Oct 17 · 8:30 AM · Littleton · Denver Suburbs

  5K13K18KTrail

  from $35
• Sat17Oct

  The Great Trailhead Foot Race 5 & 10 Miler

  Sat Oct 17 · 9:00 AM · Lakewood · Denver

  5 miles10 milesTrail

  Reg. closed
• Wed21Oct

  DU Crimson Classic 5K Run/1.5 Mile Walk

  Wed Oct 21 · 1:00 PM · Denver · Denver

  1.5 miles5K
• Thu22Oct

  4A Region 3 XC State Qualifier

  Thu Oct 22 · 11:00 AM · Northglenn · Denver

  5KTrail

  Reg. closed
• Sat24Oct

  Fall Skyline Traverse

  Sat Oct 24 · 6:00 AM · Boulder · Boulder County

  18 milesTrail

  from $25
• Sat24Oct

  Zedikiah Scholarship 5K

  Sat Oct 24 · 8:00 AM · Denver · Denver

  5K
• Sat24Oct

  Race to Cure Sarcoma Denver

  Sat Oct 24 · 8:30 AM · Denver · Denver

  1K5K

  from $10Goes up Oct 19
• Sat24Oct

  Apex Foundation Trick or Trot 5K & Halloween Hunt Powered by REP Fitness

  Sat Oct 24 · 9:00 AM · Arvada · Denver Suburbs

  1 mile5K

  from $10Goes up Oct 24
• Sat24Oct

  McGraw Memorial Park "Quick Draw @ McGraw" 2.1 & 12.6 Mile Trail Races

  Sat Oct 24 · 10:00 AM · Bailey · Foothills & Mountains

  2 miles12.6 milesTrail

  from $35
• Sat24Oct

  Hoofin' It Through the Hollows 5K

  Sat Oct 24 · 5:30 PM · Centennial · Denver Suburbs

  5K

  from $20
• Sun25Oct

  Ghosts and Goblins 5K/10K

  Sun Oct 25 · 9:00 AM · Denver · Denver

  5K

  from $36
• Sun25Oct

  The 14th Annual Odyssey Odyssey

  Sun Oct 25 · 9:00 AM · Denver · Denver

  1 mile5K
• Sat31Oct

  Halloween Trick or Trot Run 5K/10K/13.1 Denver/Aurora

  Sat Oct 31 · 7:30 AM · Centennial · Denver Suburbs

  1 mile5K10KHalf marathon

  Reg. closed
• Sat31Oct

  PB&J Fuel Run 5K/10K/13.1 Denver/Aurora

  Sat Oct 31 · 7:30 AM · Centennial · Denver Suburbs

  1 mile5K10KHalf marathon

  Reg. closed
• Sat31Oct

  Colleen De Reuck XC Classic

  Sat Oct 31 · 9:00 AM · Boulder · Boulder County

  1K3K5KTrail

  from $15
• Sat31Oct

  Hrca Backcountry Wilderness Half Marathon

  Sat Oct 31 · 9:00 AM · Lone Tree · Denver Suburbs

  Half marathonTrail

  from $85Goes up Oct 27
• Sat31Oct

  I Ain't Scared (of 5k)

  Sat Oct 31 · 9:15 AM · Thornton · Denver

  5K

  from $45Goes up Oct 18
• Sat31Oct

  Zombie Fun Run 5k & 1mile

  Sat Oct 31 · 10:00 AM · Idaho Springs · Foothills & Mountains

  1 mile5K

  from $25

Quick answers

How many races are near Denver in October 2026?

21 races are listed near Denver in October 2026. The first is Indian Creek Trail Runs on Saturday, October 17 in Sedalia, and the last is Zombie Fun Run 5k & 1mile on October 31.

What is the cheapest race near Denver in October 2026?

Race to Cure Sarcoma Denver on October 24 has the lowest listed entry fee: $10. Prices are before the registration platform's processing fee.

When does the next early-bird price end for races near Denver?

I Ain't Scared (of 5k): the 5K goes from $45 to $50 after October 18. 2 more of these races publish a later price increase.

Are there half marathons or marathons near Denver in October 2026?

Yes: 3 half marathons and 0 marathons. The first is Halloween Trick or Trot Run 5K/10K/13.1 Denver/Aurora on October 31.