All-Out Spring Fever
Golden, Colorado's Spring Fever half marathon traces scenic reservoir shores with mountain backdrops.
Race Date
Mar 21, 2027
Location
Golden, CO
Quick facts
- Date
- Sunday, March 21, 2027
- Location
- Golden, Colorado
- Distance
- Half marathon (13.1 mi) + 10K, 5K, 13.1 Miles
- Course
- Loop Course
- Terrain
- Road
- USATF certified
- Not listed
- Finishers on record
- 2,157
Highlights
Good For
Atmosphere
Course
The Experience
Set against the dramatic backdrop of Table Mountain and the Colorado foothills, the All-Out Spring Fever half marathon offers a refreshing start to the running season. This 15th annual event, held in Golden, Colorado, winds along the scenic shores of Arvada's Blunn Reservoir, utilizing the paved Ralston Creek Trail.
The course is a loop, designed to be fast and flat, making it an attractive option for those aiming for a personal best. Runners will enjoy the natural beauty of the area, with views of the reservoir and the surrounding landscape. The typical winning time of around 79 minutes suggests a competitive field, yet the event welcomes athletes of all levels.
With recent finishers numbering around 355, drawn from approximately 19 states, Spring Fever has established itself as a notable regional event. While the repeat-runner loyalty is modest at around 4%, the growing field trend indicates increasing popularity. The race also benefits the People and Pollinators Action Network and offers a chance to qualify for the BOLDERBoulder race.
Race-provided description
All-Out Multicourse is proud to host our 15th Annual Spring Fever, a rewarding event for both novice and experienced athletes set against the backdrop of Table Mountain and the stunning Colorado foothills. This spring celebration, featuring our mascot Buzzby, includes 5K, 10K, and half marathon courses that trace the scenic shores of Arvada's Blunn Reservoir via the Ralston Creek Trail. Conveniently accessible from nearby highways, Spring Fever is the endless series spring counterpart to Kooky-Spooky, and proudly benefits our NEW charity, People and Pollinators Action Network (we really love the bees). And don't miss that you can use Spring Fever to qualify for your BOLDERBoulder wave!
Logistics
Race Day
Sunday, March 21, 2027
Start Time
9:00 AM
Giveaway
T-Shirt
Start Location
19500 W 64th Pkwy, Golden, CO, 80403
Course Info
Course Type
Loop Course
Terrain
road
Scenery
Lake River, Mountain
Surface
Paved
Difficulty
Ultra-Flat
Net Drop/km
0 m (Flat)
Separation
0.0%
Also Offers
Course Map
Quality Score
Standout6813 years running
~337 finishers a year
growing or steady
4% returning runners
6 timing sources · 3 photos
runners from 19 states
winner 1:19:37
typical high 50°F
Race Day Weather
5-year historical avgStart (Low)
24°
Afternoon (High)
50°
Cool conditions — dress in layers, perfect for fast times
0.1"
Precipitation
11 mph
Wind
55%
Humidity
Historical Finish Times
How 2,157 finishers actually crossed the line across 13 years.
Most recent
2026
Total finishers
2,157
Median time
2:08:40
Latest turnout
179
States
34
Turnout by year
2018–2026
Hover the histogram to inspect specific finish times.
Race Photos
Frequently asked
When is the All-Out Spring Fever?
The All-Out Spring Fever is held on Sunday, March 21, 2027, starting at 9:00 AM.
Where does the All-Out Spring Fever take place?
It takes place in Golden, Colorado.
What distances does the All-Out Spring Fever offer?
The half marathon (13.1 miles), plus 10K, 5K, 13.1 Miles.
Is the All-Out Spring Fever course flat and good for a PR?
The All-Out Spring Fever is a ultra-flat, loop course course.
How many people run the All-Out Spring Fever?
HalfRuns has finish records for 2,157 runners who have completed the All-Out Spring Fever.
HalfRuns editorial — independent, no paid placement.
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