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Brynn Siles, 16, of Westminster, gets a hug from fellow Bolder Boulder citizen's race finisher Kristin Johansen, right, of Sante Fe, N.M., at CU Boulder's Folsom Field during the 40th annual Bolder Boulder.

Derrick Fitts, of Colorado Springs, takes a post-race selfie after finishing the 40th annual Bolder Boulder citizen's race at CU Boulder's Folsom Field.

Dressed as a taco, Arvada's Scott Hogg nears the finish line of the 40th annual Bolder Boulder citizen's race at CU Boulder's Folsom Field.

Snacks and a note for a runner wait at the ready at CU Boulder's Folsom Field during the 40th annual Bolder Boulder.

Mary Alice Portillo embraces her husband Raul Portillo, both of Coppell, Texas, moments after they crossed the finish line together at the 40th annual Bolder Boulder at CU Boulder's Folsom Field.

As the sun appears after a cloudy morning, runners cross the finish line of the 40th annual Bolder Boulder at CU Boulder's Folsom Field.

Cheryl McCarty, left, celebrates with her husband Derick McCarty, right, as the Aurora couple crosses the finish line of the 40th annual Bolder Boulder citizen's races at CU Boulder's Folsom Field. After Cheryl being diagnosed with and treated for multiple myeloma after脢running last year's Bolder Boulder, she脢was able to complete the race at a walking pace following doctors' orders.

Thousands pack CU Boulder's Folsom Field as runners compete in the citizen's races during the 40th annual Bolder Boulder.

Boulder's Shalaya Kipp, center, smiles while being congratulated by her Team USA teammates Aliphine Tuliamuk, left, and Emma Bates, right, after Kipp placed 10th in the 40th annual Bolder Boulder women's pro race at CU Boulder's Folsom Field.

Aaron Pike crosses the finish line to win the 40th annual Bolder Boulder men's push-rim wheelchair race at CU Boulder's Folsom Field, defending his 2017 title in the race.

Amanda McCrory is all smiles as she crosses the finish line to win the 40th annual Bolder Boulder women's push-rim wheelchair race at CU Boulder's Folsom Field.

Jose Jimenez of Costa Rica grins after finishing the 40th annual Bolder Boulder men's push-rim wheelchair race at CU Boulder's Folsom Field.

Boulder's Tyler McCandless crosses the finish line to win the 40th annual Bolder Boulder men's citizen race at CU Boulder's Folsom Field.

Boulder's Melissa Dock crosses the finish line to win the 40th annual Bolder Boulder women's citizen race at CU Boulder's Folsom Field, her second time winning the 10K event in three years.

Runners enter CU Boulder's Folsom Field during the 40th annual Bolder Boulder citizens race.

Spectators watch as runners enter CU Boulder's Folsom Field during the 40th annual Bolder Boulder's citizen's race.

Runners carry American flags while running the 40th annual Bolder Boulder citizen's race at CU Boulder's Folsom Field.

U.S. Marine Corps veteran Chris Campanella, of Frederick, carries the American and Marine Corps flags toward the finish line of the 40th annual Bolder Boulder citizen's race at CU Boulder's Folsom Field.

Bolder Boulder finish line crewmember James Duncan, of Boulder, high-fives runners as they finish the 40th annual Bolder Boulder citizens race at CU Boulder's Folsom Field.

Ian Huff, right, hitches a piggy-back ride with his friend Alex Martinez, both of Boulder, as they compete in the citizen's race during the 40th annual Bolder Boulder at CU Boulder's Folsom Field.

Race volunteers distribute cans of a special edition can of Oskar Blues Pinner Throwback IPA, the "official sports drink" of the 40th annual Bolder Boulder, pictured at CU Boulder's Folsom Field.

Aliphine Tuliamuk of Team USA finishes the 40th annual Bolder Boulder women's professional 10k race in second place at CU Boulder's Folsom Field.

Runner Aliphine Tuliamuk of Team USA speaks with the media after finishing the 40th annual Bolder Boulder women's professional 10k race in second place at CU Boulder's Folsom Field.

Sam Chelanga of Team USA聽Red finishes the 40th annual Bolder Boulder men's professional 10k race in ninth place at CU Boulder's Folsom Field.

Uniformed members of the U.S. Marine Corps are pictured as part of a 21-gun salute during part of the Memorial Day Tribute during the 40th annual Bolder Boulder at CU Boulder's Folsom Field.

U.S. Army veteran Stewart Boone plays Taps during the Memorial Day Tribute held at the close of the 40th annual Bolder Boulder at CU Boulder's Folsom Field. Also pictured from top left to right are: retired U.S. Army Lt. Col. John C. Russell, World War II veteran Hugh Evans and Denver7 meteorologist and tribute master of ceremonies Mike Nelson. Russell, Evans and Boone were each honored during the event for their military service. (Photo by Andy Colwell/Special to The Denver Post)

Attendees of 40th annual Bolder Boulder stand to applaud during the Memorial Day Tribute held at CU Boulder's Folsom Field at the close of the event's citizen's and professional 10k races.

A giant American flag enters CU Boulder's Folsom Field with the help of the Mile-Hi Sky Diving Center Demonstration Team during a Memorial Day Tribute held at the close of the 40th annual Bolder Boulder.