Winter Is Coming Fast: Colorado’s Top Resorts Start Snowmaking

And they’re off!

Last night, as cold temperatures arrived in Colorado’s mountains, Arapahoe Basin and Keystone Resort began snowmaking before the start of the 2025-26 season.

At Arapahoe Basin, the snow guns turned on at around 8:30 p.m. and continued firing through Monday morning, October 13, 2025.

According to the resort’s communications manager, Shayna Silverman, this is on track with past snowmaking seasons. “We typically try to kick it into high gear around mid-October,” she wrote in an email.

Check out the ski resort’s snow harvest below.

Watch: Arapahoe Basin First Snowmaking of 2025

Silverman added that snowmaking relies on cooperative wet bulb temperatures.

This measurement accounts for ambient temperature and humidity. For the snow guns to produce good results, the wet bulb temperature can't be above 26 degrees. Even better results happen when the wet bulb temperature falls to between 10 and 17 degrees.

“We're looking for cold, dry air to get a lower wet bulb temperature and produce better quality flakes—which were exactly the conditions we saw last night and through the morning,” Silverman wrote.

Keystone’s snowmaking push looked similarly encouraging for skiers.