Race Discovery
All-Out Spring Fever
All-Out Spring Fever logo

All-Out Spring Fever

Golden, Colorado, United States View on map
Mar 21, 2027 (America/Denver local time)
Running

About this race

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!

Pick your distance

Running

Half Marathon

The half marathon course begins at the NAAC parking lot, leading athletes east along the W 64th Pkwy sidewalk, then north onto the path alongside Virgil Way. Athletes will then turn right (east) onto the Ralston Creek Trail to complete a 7-mile out-and-back section before joining a challenging counter-clockwise loop around Blunn Reservoir, ultimately returning to the venue. Eight aid stations and three toilets are strategically located along the route to ensure athletes stay fueled and refreshed.

Mar 21, 2027 Half-Marathon 9:00 AM
$70.00
Open

10K

10K athletes will start from the NAAC parking lot and head east along the sidewalk on the south side of W 64th Pkwy then north on the path running alongside Virgil Wy to start the challenging counter-clockwise loop around Blunn Reservoir before returning to the venue. There are three aid stations and one toilet along the route to keep athletes fueled and refreshed.

Mar 21, 2027 10K 9:30 AM
$50.00
Open

5K

5K athletes will start from the NAAC parking lot and head east along the sidewalk on the south side of W 64th Pkwy to the first underpass and Ralston Creek Trail. Running northwest, with Blunn Reservoir on their right, athletes will turn around at 1.55 miles and return on this out & back course. Two opportunities to fuel up.

Mar 21, 2027 5K 9:40 AM
$40.00
Open

VIRTUAL Half Marathon

Participate virtually! Get all of the swag, including a distance medal, shipped to you the week after the event, maintain eligibility for series finisher award and alumni brag tags, and get distance and modified placement credit towards the Run Amok Championship!

Mar 21, 2027 Half-Marathon 9:00 AM
$40.00
Open

VIRTUAL 10K

Participate virtually! Get all of the swag, including a distance medal, shipped to you the week after the event, maintain eligibility for series finisher award and alumni brag tags, and get distance and modified placement credit towards the Run Amok Championship!

Mar 21, 2027 10K 9:00 AM
$30.00
Open

VIRTUAL 5K

Participate virtually! Get all of the swag, including a distance medal, shipped to you the week after the event, maintain eligibility for series finisher award and alumni brag tags, and get distance and modified placement credit towards the Run Amok Championship!

Mar 21, 2027 5K 9:00 AM
$25.00
Open

Typical race-day weather

Based on 14 years of Open-Meteo archive data for this event's race dates in Golden, plus the 3 days either side.

Temp (°C)
Minimum temperature (race-week average) -3.5° / Maximum temperature (race-week average) 11.7°
Feels Like (°C)
Minimum feels like — heat index / wind chill (race-week average) -8.8° / Maximum feels like — heat index / wind chill (race-week average) 10.3°
Peak wind (km/h)
Strongest wind of the day (race-week average)
16.6
Precip (mm)
Precipitation over the day (race-week average)
2.3mm
Humidity
Mean relative humidity (race-week average)
55.2%
Sunrise
Sunrise at the start line on March 21, 2027 (MDT)
Sunset
Sunset at the start line on March 21, 2027 (MDT)
Daylight
Hours between sunrise and sunset on race day
12h 11m

The sun rises at 7:02 AM and sets at 7:13 PM local time (MDT) in Golden on March 21, 2027 — 12h 11m of daylight.

Course

No course map published yet.

The organizer hasn't released a route for this event, and we don't publish guesses. If you're the organizer, send us a GPX file and we'll draw the profile.

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Results — All-Out Spring Fever

2026 edition View Results
2025 edition View Results
2024 edition View Results
2023 edition View Results

Other races near Golden

Different organizers, within 40 miles, in the next three months

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Where this page comes from. Race details were last updated on . We re-check listings regularly and again in the week before race day.

  • Entries, prices, waves and inclusions — the event's official registration page
  • Temperature and humidity — Copernicus ERA5 reanalysis via Open-Meteo (CC BY 4.0)
  • Elevation and terrain relief — Copernicus DEM GLO-90, ESA (CC BY 4.0)
  • Comparisons and counts — Race Discovery calendar, 9 Golden events

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