All-Out Spring Fever

About the Event

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!

Races Offered

Half Marathon

Mar 21, 2027

straighten

Distance — 13.1 Miles

terrain

Type — Running

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09:00

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$60.00

VIRTUAL 10K

Mar 21, 2027

straighten

Distance — 10K

terrain

Type — Running

timer

09:00

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$30.00

VIRTUAL 5K

Mar 21, 2027

straighten

Distance — 5K

terrain

Type — Running

timer

09:00

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$25.00

VIRTUAL Half Marathon

Mar 21, 2027

straighten

Distance — 13.1 Miles

terrain

Type — Running

timer

09:00

sell

$40.00

10K

Mar 21, 2027

straighten

Distance — 10K

terrain

Type — Running

timer

09:30

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$40.00

5K

Mar 21, 2027

straighten

Distance — 5K

terrain

Type — Running

timer

09:40

sell

$30.00

Weather History

These values represent the 3-year monthly averages for March in Golden.

thermostat Temperature

-3.9° / 10.6°

wb_sunny Feels like

-8.6° / 6.3°

light_mode Avg sunshine hours

10h 10m

water_drop Avg rainfall

1.8 mm

ac_unit Avg snowfall

0.9 cm

air Avg wind speed

9.0 km/h (Light breeze)

opacity Sweat loss rate

Low

terrain Course conditions

Firm and slightly soft

sunny Max UV Index

Moderate (4.0)

humidity_mid Humidity

53.0%

wb_twilight Sunrise

07:08

nightlight Sunset

19:07

About Golden

Learn more about the host city, Golden.

Golden is a city in the Denver Area of Colorado. It sits at the foothills of the Rocky Mountains, and distance-wise is roughly halfway between the cities of Boulder and Denver. It is the home of the Coors Brewery, the Colorado School of Mines, and the Colorado Railroad Museum.