All-Out Spring Fever banner
All-Out Spring Fever logo

All-Out Spring Fever 2027

Date
Sunday, March 21, 2027
Start time
9:00 AM start (Denver)
Entry fee
From $40 · goes up to $80 on Dec 22, 2026
Included with entry
Includes a shirt
Fundraising
Takes optional donations when you register
Register on RunSignup

Registration is open.

We earn a small commission when you register through this link, at no cost to you. Details

Add to calendar: Apple or Outlook · Google

Events and entry fees

EventDistanceWhenEntry feeCap
Half MarathonHalf MarathonMar 21, 20279:00 AM$70$80 after Dec 22, 2026–
10K10KMar 21, 20279:30 AM$50$60 after Dec 22, 2026–
5K5KMar 21, 20279:40 AM$40$50 after Dec 22, 2026–
VIRTUAL 10KVirtual10KMar 21, 20279:00 AM$30$40 after Dec 22, 2026–
VIRTUAL 5KVirtual5KMar 21, 20279:00 AM$25$35 after Dec 22, 2026–
VIRTUAL Half MarathonVirtualHalf MarathonMar 21, 20279:00 AM$40$50 after Dec 22, 2026–

Entry fees exclude processing fees. Prices and dates come from the race's registration page and refresh nightly.

Register on RunSignup

The Half Marathon fee goes up to $80 on Dec 22, 2026.

Race day planning

Entry fee schedule

  • Half Marathon: $70 until Dec 22, then $80 until Mar 8, then $85 until Mar 21.
  • 10K: $50 until Dec 22, then $60 until Mar 8, then $65 until Mar 21.
  • 5K: $40 until Dec 22, then $50 until Mar 8, then $55 until Mar 21.

Online registration closes Mar 21, 2027, unless the race fills first.

How the price compares

At $70, entry is about 17 percent above a typical half marathon in Colorado, which costs $60 right now.

What a typical finish looks like

A typical finisher at a half marathon in Colorado runs 2:12:38, about 10:07 a mile, based on 60 races with published results. Women typically finish in 2:19:55 and men in 2:03:31.

Light and altitude

Sunrise on race morning is at about 7:05 AM, and the Half Marathon starts at 9:00 AM. The start sits about 7,980 feet above sea level, high enough that most runners from lower ground run noticeably slower.

Fees exclude processing fees. Comparisons use current entry fees and published results from races nearby.

Start location and course

19500 W 64th Pkwy, Golden, CO 80403

The pin marks the address the race lists, which is usually the start. Course maps are the organizers' own.

5K

216
finishers
36:58
median (11:54 /mi)
20:12
winning time
62% / 38%
women / men
median 36:5820:511:08:04
Finish times, fastest to slowest. Each bar is a slice of the field; the dashed line is the median.

Half Marathon

179
finishers
2:08:41
median (9:49 /mi)
1:19:37
winning time
53% / 47%
women / men

10K

172
finishers
1:05:59
median (10:37 /mi)
34:28
winning time
57% / 43%
women / men

Aggregated from official results for All-Out Spring Fever. Individual finisher names are not stored here.

How fast do you need to be at All-Out Spring Fever?

At the 2026 5K, the fastest tenth finished in 25:49 or better, the top quarter in 29:11, and half the field in 36:58; the last tenth came in after 55:07.

At the 2026 Half Marathon, the fastest tenth finished in 1:38:49 or better, the top quarter in 1:55:11, and half the field in 2:08:41; the last tenth came in after 2:46:29.

At the 2026 10K, the fastest tenth finished in 48:49 or better, the top quarter in 57:36, and half the field in 1:05:59; the last tenth came in after 1:27:32.

Third place by age group, 2026 5K
AgeWomenMen
Under 2055:0422:28
20-2928:1423:09
30-3925:5924:10
40-4926:4323:14
50-5932:2227:42
60-6935:09n/a
70+50:2438:58

Groups with fewer than five finishers are left out. Awards vary by race; check the race's rules.

What would my time get me?

Where a finish time would have placed in 2026.

Finishers by year

Up 40 percent since 2023.

All events combined, from official results.

All-Out Spring Fever 5K year by year

From 2023 to 2026, the field went from 132 to 216 finishers, and the median time rose from 35:49 to 36:58.

YearFinishersMedianFastest tenthWinner
2026216 (+65%)36:58under 25:4920:12
2025131 (+14%)36:40under 27:3820:30
2024115 (-13%)34:59under 25:0218:18
202313235:49under 26:5820:48

From each year's official results for the 5K; virtual options are left out.

How fast is it?

About average for Colorado 5Ks

The fastest quarter of the 2026 5K field finished under 29:11, against 29:37 in a typical Colorado 5K, so times here are about average.

  • Half Marathon: About average for Colorado half marathons. The fastest quarter of the 2026 half marathon field finished under 1:55:11, against 1:56:43 in a typical Colorado half marathon, so times here are about average.
  • 10K: Slower than most Colorado 10Ks. The fastest quarter of the 2026 10K field finished under 57:36, against 55:16 in a typical Colorado 10K, so times here run 4 percent slower.

Compares the fastest quarter of each field, so walkers and first-timers do not skew it. It reflects the course and the field together: a flat course, cool weather, or a competitive crowd all make times faster.

Typical race-day weather

Around March 21 the day usually runs from 28°F at dawn to 53°F in the afternoon, with measurable rain on about 19% of days. Cold snaps dip to 16°F and hot years reach 76°F.

Based on 90 days within a week of the date over the last 5 years, from historical weather for the start area. Not a forecast.

From the race's page

What the organizers of All-Out Spring Fever cover on their registration page, in brief.

Schedule and packet pickup

Schedule

Saturday, March 22. 12:30-3:30p Early packet pick-up & walk-up registration. Location: TBD. Sunday, March 23. 8:00a Packet pick-up and registration open. 8:50a Half marathon pick-up/registration close. 9:00a Half marathon start. 9:20a 10K…

Course

Course details

Jefferson County's NAAC Stadium. 19500 W 64th Pkwy, Golden, CO 80403. Wheelchair/Stroller Access: All are welcome, but there is one short (300') unpaved, gravel soft surface section of the course you should consider before registering…

Course details, from the All-Out Spring Fever page

Shirt and medal

Features & SWAG

♦ RRCA Certified Race Director— Organization you can count on! With hundreds of events under the belt of our director and a staff with 25+ years experience, your event will run smoothly. (Ha! No pun intended). ♦ Early AND Race Day Packet…

Features & SWAG, from the All-Out Spring Fever page
Full details on the race's RunSignup page

Race details

Where
19500 W 64th Pkwy, Golden, CO 80403Map
Course
Road
Start elevation
About 7,980 feet
Included with entry
T-Shirt
Donations
Accepted when you register
Distances
5K, 10K, Half Marathon
Editions
2027 (Mar 21, 2027), 2026 (Mar 22, 2026), 2025 (Mar 23, 2025), 2024 (Mar 17, 2024), 2023 (Mar 19, 2023), 2022 (Mar 20, 2022)

Organize this race? Add details or a correction

Plan your race

Quick answers

When is All-Out Spring Fever?
Sunday, March 21, 2027, starting at 9:00 AM.
How much does it cost?
Entry starts at $40 before processing fees, and rises to $80 on Dec 22, 2026.
When does registration close?
Online registration closes Mar 21, 2027, unless the race fills first.
Is the entry fee high for Colorado?
At $70, entry is about 17 percent above a typical half marathon in Colorado, which costs $60 right now.
Do runners get a shirt or medal?
Entry includes a shirt, according to the race's registration page. Check it for sizes and whether kids' races get the same.
Can I donate to a cause when I register?
Yes. The registration form offers an optional donation, usually for the charity or nonprofit the race supports. The race's own page names the cause.
What distances can I run?
5K, 10K, Half Marathon.
How big is it, and how fast?
In 2026, 216 runners finished the 5K; the median finish was 36:58 and the winner ran 20:12.
Is it a fast course?
The fastest quarter of the 2026 5K field finished under 29:11, against 29:37 in a typical Colorado 5K, so times here are about average.
Where does it start?
19500 W 64th Pkwy, Golden, CO 80403.
Is there a course map?
Yes, the organizers publish the route on Plotaroute; the link is under Start location and course.

From the organizers

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!