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44th Annual Big Brothers Big Sisters of Flagstaff Half Marathon and 5K

Presented by Big Brothers Big Sisters at Thorpe Park, Flagstaff AZ

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Aug 14 2021
44th Annual Big Brothers Big Sisters of Flagstaff Half Marathon and 5K

Flagstaff’s longest running footrace that takes place on Observatory Mesa.

Join the 2nd oldest half marathon in Arizona sponsored by Kinney Construction Services! While we are hosting our 44th annual race in person on August 14th, we will also offer a virtual race that you can run anywhere or on course!  For those who wish to run virtually between August 8th and August 22nd, we will be offering the free RaceJoy App that will allow you to follow the beautiful course that starts at Thorpe Park (do note no longer Wheeler Park!) and climbs the steep urban trail onto

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Half Marathon - $70

5K - $40

Kids Dash - $10

Virtual - Either Race $40

Virtual Kids - $10

Contact: 928-774-0649

Email: natraneil@gmail.com

    Official Website


Additional time info:

STARTING TIMES: Early Half Marathon for non-competitive walkers/runners (you are timed but do not compete in age division standings) start at 6 AM, Regular Half Marathon 7:30 AM, 5K at 7:45  AM, and Kid's Dash (1KM) goes off right after 5K.

August 13th FRATELLI'S PIZZA PARTY PACKET PICK UP: All registered runners get a free pizza party from 5:30 to 7:30 PM at Thorpe Park Picnic Ramada where you can pick up your Bib and shirt. This is also the last opportunity to register as there will be no race day registration (you can pick up your Bib and shirt on race day).

All participants in the Half Marathon/Half Marathon Walk/5K Fun Run/ or Virtual Half Marathon/Virtual 5K will get a Sweatvac hi-tech dye sublimated T-shirt. This year, Only Kid's Dash participants will get a finisher's medal.

Big Brothers Big Sisters of Flagstaff Half Marathon is also part of the Flagstaff Running Series value package of five of Flagstaff's most iconic foot races. You can also register for the race through the Series and save BIG by learning more at the Flagstaff Running Series registration page!

The in-person half marathon is also part of the 2021 Series Runner Arizona Half Series where you can run Arizona's most popular half marathons and win medals for doing so!

So join us in person on August 14th or Walk/Run either race course ANYTIME between August 8th and August 22nd or pick your own course and the upload and share your time!

* Event durations (if noted) are approximate. Please check with the presenting organization or venue to confirm start times and duration.


  • Half Way point on Observatory Mesa


  • Why I love BBBSF Half Marathon


Thorpe Park

191 North Thorpe Road, Flagstaff, AZ 86001

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