Popeye's Backyard Ultra Greenland Open Space takes place on April 3, 2027, at the picturesque Greenland Open Space near Larkspur, Colorado. The race begins promptly at 7:00 AM and continues through a loop course of 4.167 miles until just one runner remains standing. Nestled in Douglas County's Palmer Divide, this expansive open space offers rolling grasslands, oak draws, ponderosa pines, and rocky mesas with the Front Range as a breathtaking backdrop. Early April brings unpredictable weather to Greenland Open Space, transitioning from sunny days to possible snowfall within hours, adding an element of challenge for participants. The race follows strict Backyard Ultra rules: every hour on the hour, runners must start another lap together if they are still in contention. Completing each yard under one hour keeps you in the running; miss a bell or fail to finish within that timeframe and your race is over. The course features dirt trails with crushed gravel sections, winding through diverse terrain from rolling hills to rocky mesas. Aid stations staffed by volunteers provide support between yards at the trailhead where runners can rest, refuel, and strategize with their crews. Headlamps are required for any yard that starts after sunset as Douglas County has granted permission for the race to run into the night. Despite its challenging format, Popeye's Backyard Ultra is known for fostering a welcoming atmosphere among participants who cheer each other on through long hours of competition. This inaugural event aims to set a precedent for future races by adhering strictly to rules while ensuring all runners feel supported and encouraged throughout their journey. The race welcomes up to 200 runners with an entry fee of $95, providing access to course amenities like port-a-lets and aid stations without the need for additional fees. Registration closes on March 31, 2027, at 11:59 PM MT. Popeye's Backyard Ultra is a unique endurance challenge that celebrates perseverance in nature’s raw beauty.
Races Offered
96hrs
Apr 03, 2027
straighten
Distance —
96 Hours
terrain
Type —
Running
timer
07:00
sell
$95.00
Weather History
These values represent the 3-year monthly averages for April in Larkspur.
thermostatTemperature
-1.9° / 12.8°
wb_sunnyFeels like
-6.4° / 7.8°
light_mode
Avg sunshine hours
10h 49m
water_drop
Avg rainfall
2.0 mm
ac_unit
Avg snowfall
1.1 cm
air
Avg wind speed
10.8 km/h (Light breeze)
opacity
Sweat loss rate
Low
terrain
Course conditions
Firm and slightly soft
sunny
Max UV Index
Moderate (5.0)
humidity_mid
Humidity
53.6%
wb_twilight
Sunrise
06:21
nightlight
Sunset
19:37
About Larkspur
Learn more about the host city, Larkspur.
Larkspur is a home rule municipality in Douglas County, Colorado, United States. The town population was 206 at the 2020 census. Each year, on weekends in June, July and August, the Colorado Renaissance Festival is held in the hills just west of the town. The town is served by Larkspur Elementary School, a K-6 school in the Douglas County school district.