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GMR Backyard Ultra logo

GMR Backyard Ultra

Sat, May 23, 2026, 10:00 AM MDT

Location
Golden, CO
Address to be supplied after registration, 80401
Type
RUN
Official registration

Sign up and verify details on the organizer’s official page.

At a glance

Embrace the unique Backyard Ultra challenge: complete a 4.17-mile lap every hour until you're the last runner standing, all for a good cause.

  • Fun
  • Competitive
  • Quirky
  • For a Cause

Great for: cause-driven runners, runners who like a competitive edge

Less ideal for: walkers-only pacing

The GMR Backyard Ultra in Golden, CO, offers a unique endurance challenge where runners complete a 4.17-mile lap every hour until only one remains. This event is designed for both social enjoyment with friends and pushing personal limits to ultra distances. Participants can strategically run fast for rest or conserve energy with a slower pace. A recommended donation supports the Sun Valley Kitchen and Community Center, adding a meaningful cause to this test of endurance and camaraderie.

What to expect

  • Experience the unique backyard ultra format, completing a 4.17-mile lap each hour.
  • Strategize your pace to run fast and rest, or conserve energy for the long haul.
  • Aid station items and temporary bathrooms are provided, with awards for top finishers.

Standout details

  • Backyard Ultra format
  • Hourly 4.17-mile laps
  • Last runner standing challenge
  • Supports Sun Valley Kitchen and Community Center

Auto-drafted from the public listing — confirm details on the official event page before signing up.

The course

  • —
From the organizer

Date: 5/23/26

Time: 10:00 AM (check-in starts at 9:00)

Cost: $50.00 + Recommended minimum $25.00 Donation

Non-Profit Recipient: Sun Valley Kitchen and Community Center

The backyard Format:  Run one every hour until only one runner remains.  Every lap starts at the top of the hour, so you can choose to run your lap fast and get rest in between or run slow and save your energy.  This is intended to be a fun event with friends.  Come do one lap, or push yourself to the ultra distance if you chose.  4.17 mile lap

Registration is limited to the first 60 signups. The cost is $50. We also recommend a minimum $25 Donation to Sun Valley Kitchen and Community Center.  The registration fee will be used to supply aid station items, awards and temporary bathroom facilities (port-a-potties).

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