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Runners cast long shadows as they make their way through the Denver Zoo during the Colfax Marathon at City Park on May 21, 2017, in Denver. The 12th annual Colfax Marathon took thousands of runners on an urban tour of Denver, including a run through the Denver Zoo for those participating in the half marathon.

Ramon Paredes Becerra of Mexico raises his hands in the air as he crosses the finish line in first during the Colfax Marathon at City Park on May 21, 2017, in Denver. The 12th annual Colfax Marathon took thousands of runners on an urban tour of Denver, including a run through the Denver Zoo for those participating in the half marathon.

Brittany Lee raises her hands in the air as she crosses the finish line in first during the Colfax Marathon at City Park on May 21, 2017, in Denver. The 12th annual Colfax Marathon took thousands of runners on an urban tour of Denver, including a run through the Denver Zoo for those participating in the half marathon.

Leah Beisner, left, and Zonia Valenciano check their phones as they warm up before the Colfax Marathon at City Park on May 21, 2017, in Denver. The 12th annual Colfax Marathon took thousands of runners on an urban tour of Denver, including a run through the Denver Zoo for those participating in the half marathon.

Sarah Villasenor stretches as she warms up for the half marathon during the Colfax Marathon at City Park on May 21, 2017, in Denver. The 12th annual Colfax Marathon took thousands of runners on an urban tour of Denver, including a run through the Denver Zoo for those participating in the half marathon.

Aaron Pendergraft and Colin Meyer sit in the starting area as they wait for the start of the Colfax Marathon at City Park on May 21, 2017, in Denver. The 12th annual Colfax Marathon took thousands of runners on an urban tour of Denver, including a run through the Denver Zoo for those participating in the half marathon.

Runners prepare as they wait for the start of the Colfax Marathon at City Park on May 21, 2017, in Denver. The 12th annual Colfax Marathon took thousands of runners on an urban tour of Denver, including a run through the Denver Zoo for those participating in the half marathon.

Runners wait the start line for the start of the half marathon during the Colfax Marathon at City Park on May 21, 2017, in Denver. The 12th annual Colfax Marathon took thousands of runners on an urban tour of Denver, including a run through the Denver Zoo for those participating in the half marathon.

Runners prepare as they wait for the start of the Colfax Marathon at City Park on May 21, 2017, in Denver. The 12th annual Colfax Marathon took thousands of runners on an urban tour of Denver, including a run through the Denver Zoo for those participating in the half marathon.

Runners sprint from the start line during the start of the Colfax Marathon at City Park on May 21, 2017, in Denver. The 12th annual Colfax Marathon took thousands of runners on an urban tour of Denver, including a run through the Denver Zoo for those participating in the half marathon.

A runner carries an American flag as she sprint from the start line during the start of the Colfax Marathon at City Park on May 21, 2017, in Denver. The 12th annual Colfax Marathon took thousands of runners on an urban tour of Denver, including a run through the Denver Zoo for those participating in the half marathon.

Ashok Vasan, 12, warms up before running the half marathon of the Colfax Marathon at City Park on May 21, 2017, in Denver. The 12th annual Colfax Marathon took thousands of runners on an urban tour of Denver, including a run through the Denver Zoo for those participating in the half marathon.

Nathaniel Waite-Lutz, 11, gives high fives and encouragement to runners as they make their way through the Denver Zoo during the Colfax Marathon at City Park on May 21, 2017, in Denver. The 12th annual Colfax Marathon took thousands of runners on an urban tour of Denver, including a run through the Denver Zoo for those participating in the half marathon.

A runner grabs a bottle of water out of a tub after finishing the Colfax Marathon at City Park on May 21, 2017, in Denver. The 12th annual Colfax Marathon took thousands of runners on an urban tour of Denver, including a run through the Denver Zoo for those participating in the half marathon.

Runners make their way across the finish line during the Colfax Marathon at City Park on May 21, 2017, in Denver. The 12th annual Colfax Marathon took thousands of runners on an urban tour of Denver, including a run through the Denver Zoo for those participating in the half marathon.

Runners make their way across the finish line during the Colfax Marathon at City Park on May 21, 2017, in Denver. The 12th annual Colfax Marathon took thousands of runners on an urban tour of Denver, including a run through the Denver Zoo for those participating in the half marathon.

Runners make their way through the Denver Zoo during the Colfax Marathon at City Park on May 21, 2017, in Denver. The 12th annual Colfax Marathon took thousands of runners on an urban tour of Denver, including a run through the Denver Zoo for those participating in the half marathon.

A volunteer holds an arm full of finisher medals during the Colfax Marathon at City Park on May 21, 2017, in Denver.The 12th annual Colfax Marathon took thousands of runners on an urban tour of Denver, including a run through the Denver Zoo for those participating in the half marathon.

A runner yells after crossing the finish line during the Colfax Marathon at City Park on May 21, 2017, in Denver. The 12th annual Colfax Marathon took thousands of runners on an urban tour of Denver, including a run through the Denver Zoo for those participating in the half marathon.

Runners make their way across the finish line during the Colfax Marathon at City Park on May 21, 2017, in Denver. The 12th annual Colfax Marathon took thousands of runners on an urban tour of Denver, including a run through the Denver Zoo for those participating in the half marathon.

Stephanie Hickey, right, comforts Kristi Dougherty on a tough race after they crossed the finish line during the Colfax Marathon at City Park on May 21, 2017, in Denver. The 12th annual Colfax Marathon took thousands of runners on an urban tour of Denver, including a run through the Denver Zoo for those participating in the half marathon.