Saturday, August 29th, 2026
Arapahoe County Fairgrounds, Aurora CO
5K · 1 Mile
59–83°F · low rain risk
See last 10 years
On this date: rain 1 of the last 10 years
2025
58–79°F
rain
2024
62–81°F
dry
2023
54–80°F
dry
2022
58–84°F
dry
2021
58–83°F
dry
2020
57–78°F
dry
2019
65–89°F
dry
2018
55–86°F
dry
2017
62–86°F
dry
2016
55–77°F
dry
Best months to race in Colorado →
Race-day ready
Everything but the shoes.
Real running socks, a bib belt, anti-chafe — the cheap upgrades that matter.
About this race
Event Overview
- Date and Time: August 29, 2026, with activities starting at 7:00 am.
- Location: Arapahoe County Fairgrounds, Aurora, CO.
- Schedule:
- 7:50 am - National Anthem
- 8:00 am - 5K Trail Run
- 8:10 am - Family 5K Trail Walk (dogs welcome!)
- 8:45 am - Kids 1-mile Trail Run/Walk
- Breakfast: Enjoy a free pancake breakfast for all registered participants.
Entertainment and Activities
- Dog Costume Contest: Participate in our colorful contest with prizes.
- Training Demonstrations: Watch therapy and patrol dog training throughout the day.
- Kids Zone: Enjoy inflatables, lawn games, and face painting.
- Vendor Marketplace: Explore giveaways and consult with pet specialists.
About K-9 Rex
- Who is Rex: K-9 Rex, a therapy dog, provides comfort to students.
- Organization: Presented by Back The Blue K-9 Force, a nonprofit supporting K-9 units.
- Fundraising: 100% of net profits go to the nonprofit.
- Learn More: Visit Back The Blue K-9 Force.com.
Registration Options
- 8:00 am: 5K Trail Run
- 8:10 am: Family 5K Trail Walk (dogs welcome!)
- 8:45 am: Kids 1-mile Trail Run/Walk
Pricing Schedule
- March 1 - June 30: $45 + processing fee
- July 6 - Day of Race: $50 + processing fee
Special Offers
- Complimentary Ticket: Free CO Rapids ticket with the purchase of additional tickets.
- Support RexRun: $5 from every ticket sold will benefit Rex Run!
Included with Registration
- RexRun for PAWSitivity Commemorative T-shirt
- A goody bag full of giveaways
- Finishers medal
- Pancake breakfast
Fundraising Opportunities
Join us in fundraising with your personal page. Learn more or Be a fundraiser!
Honorary K-9 Deputy Program
Sign your dog up to be an Honorary K-9 Deputy for just $10. Receive a badge and a personalized certificate. Click here to honor your pup!
Donations and Auction Items
Browse our Amazon gift list for silent auction items.
Awards
Awards will be given to the top three male and female runners at the ceremony after the race.
Packet Pick-Up
Packet pick-up is available on the day of the race in the Main Hall beginning at 7 am.
Safety Guidelines
- Keep dogs on a 6-foot leash: retractable leashes are not allowed.
- Clean up after your pet: receptacles will be provided.
- Respect law enforcement K-9 units and their space.
- Strollers and dogs allowed in the 5K walk and kid's run/walk only.
Weather Policy
The event will proceed rain or shine unless extreme weather conditions arise. Please stay alert to weather updates.
Event Link
For more details and to register, visit the official site: RexRun for PAWSitivity 2026.
Course map
Train with a club
Run clubs near Aurora to train with before race day.
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