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People take advantage of the freshly fallen snow to sled down a hill at Chautauqua Park with the first Flatiron in the background on Nov. 12 in Boulder. (Helen H. Richardson, The Denver Post)

People take advantage of freshly fallen snow to sled down a hill at Chautauqua Park with the first Flatiron in the background on Nov. 12 in Boulder. (Helen H. Richardson, The Denver Post)

Aidan, 7, walks with his shoe that fell off after sledding down a hill Saturday, April 29, 2017, in Ruby Hill Park. (Daniel Brenner, Special to the Denver Post)

Erik Montgomery takes a drink while sledding Saturday, April 29, 2017 ,in Ruby Hill Park. (Daniel Brenner, Special to the Denver Post)

Tori Bilbrey, 8, right, pulls her brother Tyler, 9, into a jump while sledding Saturday, April 29, 2017, in Ruby Hill Park. They said they come to the park whenever it snows. (Daniel Brenner, Special to the Denver Post)

Tori Bilbrey, 8, left, and her brother Tyler, 9, crash while sledding Saturday, April 29, 2017, in Ruby Hill Park. They said they come to the park whenever it snows. (Daniel Brenner, Special to the Denver Post)

Mark LaMadeleine enjoys sledding with his daughter Juliet LaMadeline, 7, on the quickly melting snow at Scott Carpenter Park on March 27 in Boulder. (Helen H. Richardson, The Denver Post)

Mark LaMadeleine enjoys sledding with his daughter Juliet LaMadeline, 7, on the quickly melting snow at Scott Carpenter Park on March 27 in Boulder. (Helen H. Richardson, The Denver Post)

Mark LaMadeleine enjoys sledding with his daughter Juliet LaMadeline, 7, on the quickly melting snow at Scott Carpenter Park on March 27 in Boulder. (Helen H. Richardson, The Denver Post)

Iris Broisat, 11, right, and Ira Thomas, 11, left, carry their sled back up the hill as they enjoy sledding down a hill at Chautauqua Park with the first Flatiron in the background on Nov. 12 in Boulder. (Helen H. Richardson, The Denver Post)

Michelle Sroda, an Arizona transplant now living in Denver, is all smiles heading sledding down course at Ruby Hill Park on Dec. 17, 2016. (Andy Cross, The Denver Post)

Denly Stone, 8, left, and his brother Mayne, 10, from Texas enjoy sledding during their holiday visiting Denver at Ruby Hill Park in Denver on Dec. 21, 2017. (Hyoung Chang, The Denver Post)

BOULDER, CO - DECEMBER 30: Chris Rabenhorst, left, takes photos of his daughter Ava 8, as she flies over a jump as they sled at Scott Carpenter Park in Boulder, Colorado on December 30, 2015. The two are from Longmont.Temperatures remain cold. (Photo by Helen H. Richardson/The Denver Post)

Kids enjoy sledding at Scott Carpenter Park in Boulder, Colorado on Dec. 30, 2015. (Helen H. Richardson, The Denver Post)

Ava Rabenhorst, 8, from Longmont, enjoys sledding at Scott Carpenter Park in Boulder, Colorado on Dec. 30, 2015. (Helen H. Richardson, The Denver Post)

BOULDER, CO - DECEMBER 30: Ava Rabenhorst, 8, from Longmont, enjoys sledding at Scott Carpenter Park in Boulder, Colorado on December 30, 2015. Temperatures remain cold. (Photo by Helen H. Richardson/The Denver Post)

Ava Rabenhorst, 8, from Longmont, enjoys sledding at Scott Carpenter Park in Boulder, Colorado on Dec. 30, 2015. (Helen H. Richardson, The Denver Post)

Laysha Gutierrez, 9, of Longmont, enjoys sledding at Scott Carpenter Park in Boulder, Colorado on Dec. 30, 2015. (Helen H. Richardson, The Denver Post)

Chris Rabenhorst and his daughter Ava, 8, from Longmont, enjoy sledding at Scott Carpenter Park in Boulder, Colorado on Dec. 30, 2015. Temperatures remain cold. (Helen H. Richardson, The Denver Post)