This event has been rescheduled from 25 Apr 2021

Boulderthon: Inaugural Downtown Edition

10 Oct 2021 (Sun)


Marathon, Half marathon

Boulderthon: Inaugural Downtown Edition

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Join Boulderthon: Inaugural Downtown Edition 2021

Running is the heartbeat of Boulder — one of the three hallmark recreational activities of our community (along with cycling and hiking, of course).

Together, we run the streets & trails of Boulder and serve as one of the great training grounds for Olympians, world-class athletes, and leisure runners alike. We are so grateful & proud to have the world's best 10k — but despite running being hardwired into Boulder’s DNA — we have no signature city marathon.

This was the question we asked everyone — and we couldn’t find out why.

In one of the great health meccas of the US, rated one of the healthiest, happiest cities in the country, we couldn’t find a premier long-distance marathon.

After years in the making and the opportunity to acquire a 19-year-old race series, the Boulder Backroads Marathon & Half Marathon, we knew the time was now. As residents of Boulder County and local business owners, our goal from day 1 has been to create an inspiring, community-driven marathon series to serve as the premier fall race in the state. We decided to create the epic, downtown marathon race the beautiful city and community of Boulder deserves.

The race starts at the beautiful Boulder Reservoir, and finish on Pearl St, Downtown, with sweeping views of the Flatirons throughout. Our Full and Half Marathon will run through County farmland before finishing in a first-of-its-kind, epic finish at the heart and soul of downtown Boulder.

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Course profile

Half marathon

Route map

directions_runStart Address: Boulder Reservoir, Boulder, CO, USA

flagFinish Address: 1500 Pearl St, Boulder, CO 80302, USA

Boulderthon: Inaugural Downtown Edition Route Map


Registration closes on 07 October (106 days left)

Full Marathon

42.20 Km

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€ 100.30

Marathon - VIP

42.20 Km

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€ 193.02

Half Marathon

21.10 Km

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€ 91.87

Half Marathon - VIP

21.10 Km

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€ 176.16

selected tickets

Total € 0.00

selected tickets


€ 0.00

You can, within 24 hours after your registration, get a full refund if you change your mind.

We accept Visa MasterCard AMX PayPal Multibanco iDEAL WeChat Pay AliPay

Included in the fee

Event T-shirt, finisher medal, race bib, chip timing, hydration, medical support.


After Race Services

Post-Race Party will be held at the Finish Line on the iconic Pearl Street Mall!

Award Medals

Finisher medal

Maximum Time

The marathon time limit is 6 hours, and the half marathon limit is 3 hours.

Race Kit Includes

Event T-shirt, race bib




Shuttles to the start will be provided to all half & full marathon runners from Downtown Boulder. Friends & family may also ride shuttles for free. Priority boarding will be provided to runners.



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Boulderthon: Inaugural Downtown Edition

check_circle 24h ticket cancellation

check_circle Lowest price guaranteed

check_circle Deals & Discounts

The race information has been found on the official website of the event or through publicly available sources. Always refer to the official website the latest race information. Please let us know if any data is wrong or missing, by emailing us.