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All-Out Spring Fever Half Marathon, 10K, 5K & 1Mile

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Distances in this event

  1. Half Marathon

    Run 13.1mi
    Event passed
  2. 10k

    Run 10km
    Event passed
  3. 5k

    Run 5km
    Event passed
  4. 1 Mile

    Run 1mi
    Event passed

Event details

  • Trails
  • Mixed
  • Race packs collected on the day
  • 500 participants

Meet the organizer

From the base of Table Mountain and Colorados spectacular foothills, All-Out Multicourse presents our 7th annual Spring Fever from Jefferson Countys NAAC Stadium easily accessible from Hwy 93, 6th Ave, Hwy 58 or I-70. Along with its Endless Series sidekick in October Kooky-Spooky, these 1M, 5K, 10K & Half Marathon courses will hug the shores of Arvadas Blunn Reservoir via the Ralston Creek Trail and will challenge the beginner and veteran athlete alike.

Other events from this organizer

Course Maps
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What’s Included

Early AND Race Day Packet Pick-Up – For those who like to prep in advance!
Sure, picking up early gets you another chance to win a prize, but no worries if you wait until race day… we make it quick & easy.

Race Shirts – The one you’ll want to wear EVERY day! Long-sleeved, & gender specific, of course… still poly for those moisture wicking properties, but with a touch of cotton for extreme comfiness.


Course Details

Half Marathon Course  (3% Asphalt / 96% Concrete / 1% Soft Surface)

Half Marathon Athletes will depart the east end of the NAAC parking lot then utilize the sidewalk on the south side of W 64th Pkwy to reach the east underpass and the path that runs north along Virgil Wy. Turning right to go east on Ralston Creek Trail, half athletes will complete a 7 mile out & back dogleg before rejoining the counterclockwise Blunn Reservoir loop. Utilizing the west underpass at the reservoir entrance, athletes will make their way back up onto the 64th sidewalk then return the way they came to the finish line. Porta-poos will be available near the 3, 7.5 & 9-mile marks, and 6 aid stations will offer 8 opportunities for athletes to fuel up every 1 to 1.5 miles.

10K Course  (7% Asphalt / 92% Concrete / 1% Soft Surface)

10K athletes will depart the east end of the NAAC parking lot then utilize the sidewalk on the south side of W 64th Pkwy to reach the east underpass and the path that runs north along Virgil Wy. Athletes will continue north until just past Tucker Lake, then west and south, following Ralston Creek Trail around Blunn Reservoir.  Utilizing the underpass at the reservoir entrance, athletes will make their way back up onto the 64th sidewalk then return the way they came to the finish line.  Porta-poos will be available just before the 2-mile mark, and aid stations will be positioned at or near 1.5, 2.2, 3.8 and 5.1 miles.

5K Course  (15% Asphalt / 83% Concrete / 2% Soft Surface)

5K athletes will depart the east end of the NAAC parking lot then utilize the sidewalk on the south side of W 64th Pkwy to reach the west underpass and Ralston Creek Trail. Running northwest, with Blunn Reservoir on their right, athletes will have access to 1 aid station twice (named Aid 6 for event purposes) on this out & back course.

1M Course  (46% Asphalt / 54% Concrete)

1 Mile athletes will depart the east end of the NAAC parking lot then utilize the sidewalk on the south side of W 64th Pkwy to reach the underpass and Ralston Creek Trail. Running northwest for a short distance to the .5 mile mark, athletes will then turn around to return the way they came on this out & back course.

Raceday Logistics

Thursday, 21st March

11:59 pm – Online Registration Closes

Friday, 22nd March

4:00 pm – 7:00 pm – Early Packet Pick-Up & Walk-Up Registration- Photo ID Required

Sunday, 24th March

7:00 am – Volunteer Check-In
7:45 am – Race Day Packet Pick-Up & Walk-Up Registration Opens- photo ID
8:45 am – Half Marathon Pick-Up & Registration Closes
9:00 am – Half Marathon Start
9:30 am – 10K Pick-Up & Registration Closes
9:45 am – 10K Start / 5K Pick-Up & Registration Closes
9:55 am – 5K Start
10:00 am – 1M Start
10:30 am – 1M Awards & Prize Drawing
10:45 am – 5K Awards & Prize Drawing
11:15 am – 10K Awards & Prize Drawing
12:00 pm – Half Marathon Awards & Prize Drawing


Spectators are welcome!


Without YOU, these events simply would NOT be possible. From event prep to packet pick-up, and from course marshals to finish aid, there are a ton of ways you can help, even with no experience whatsoever! Sure… when you volunteer, you get that warm & fuzzy feeling that comes from giving back, but with All-Out, there’s WAY more to it than that. Head to the official race website to volunteer!

    Don’t let this sport take a chunk out of your wallet! With our ‘Earn a Free Entry’ program, you will receive a FREE 1M or 5K entry with 2 volunteer credits, a FREE 10K entry with 3, a FREE half marathon with 4, or wow… a FREE marathon entry with just 6 credits! You pick the dates, then you pick your race, it’s just that easy. Space is limited and is awarded first come, first served, so get in early!

    Racking up those volunteer hours doesn’t have to be a drag! If you love recreation (and who doesn’t), out with the boring… in with the excitement of an outdoor event! Each of our events supports a nonprofit organization so volunteering for All-Out will fit the bill in most cases. Earn those credits in the most fun way possible. Again, space is limited so be sure to get in touch early!


♦ Brag Tags – For all repeat finishers! Our little way of saying ‘Thanks for making Polar Prowl a tradition!’

Souvenir Race Bibs – Event specific and personalized! Personalized for all who get in by the advanced deadline… yet another keepsake to remember your day!

FREE Race Pics – Unlimited downloads are on us! Professional photographers at the finish line AND on course… enjoy!

Gear Check – No trips back to the car for our athletes… no sir-ee! Leave it with us… we’ll keep an eye on it for you.

Porta-Poos-A-Plenty – 3 Units for 500 people? What, are you crazy? Ever had to run without using a restroom because the lines were too long? Us too… ouch! We provide more than TRIPLE the facilities as other events.

Accurately Measured Courses – Race the distance you trained for! Not a little more and not a little less… we measure each course no fewer than 3 times before race day and mark them so they’re crystal clear.

Medical Support – Nothing is more important than your safety! Here’s hopin’ those guys are really bored, but just in case… you’ll find our med crew both at the start/finish AND on course. Plus, each and every volunteer you pass know who to call for help.

Tons of Aid Stations – No need to carry any extra weight! Not only will both water & electrolytes be handed to you at the finish line, but course aid stations are an average of just 1.2 miles apart.

Disposable Timing Chips – No hassle at the finish line! And no fees if you forget to return your timing chip either… we don’t need it back.

Electronic Results – No more endless sheets of data to sort through! All results scroll on easy to read computer screens in the expo area during the event and are posted online by the end of the day.

Text Results & Placements – Individually sent to all who opt in! Just provide your mobile number with your entry, then text the keyword ALLOUT to 550055 from that mobile device. Yup… it’s that easy!

Post-Race Meal – Breakfast tacos, fruit, bagels & chocolate milk for all! Yup, even if you’re dead last… we’re not going anywhere until we cheer you in.

3 Deep Awards – Overall AND Divisions! Events small enough to stay friendly and personal give you a better chance of landing on the podium! (1 Mile awards will be given to the top 3 in each gender only, for the time being.)

Prizes Galore – If you’re registered, you’re entered… easy peasy! Just bring us your ticket at the start of your award ceremony and you’re in! (Psst… in most cases, everyone who sticks around for the giveaway goes home with a prize!)

Finisher Medals – Custom moulded & distance specific, even for the 5K! Then a little something special for our 1 Milers too.

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