Keystone, CO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Keystone, a community in Summit County, Colorado.
This Afternoon
35°F
Snow Showers
Snow showers. Mostly cloudy. High near 35, with temperatures falling to around 29 in the afternoon. Southeast wind around 10 mph, with gusts as high as 16 mph. Chance of precipitation is 80%. New snow accumulation of 2 to 4 inches possible.
7-day forecast for Keystone
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 35°F | Snow Showers | 10 mph SE | 79% |
| Tonight | 20°F | Snow Showers | 2 to 10 mph N | 79% |
| Thursday | 36°F | Sunny | 2 to 8 mph WSW | 0% |
| Thursday Night | 24°F | Mostly Cloudy | 3 to 9 mph SSE | 1% |
| Friday | 35°F | Chance Snow Showers | 3 to 7 mph W | 40% |
| Friday Night | 19°F | Slight Chance Snow Showers then Partly Cloudy | 5 mph WNW | 21% |
| Saturday | 37°F | Sunny | 3 to 7 mph NW | 1% |
| Saturday Night | 23°F | Mostly Clear | 5 mph WNW | 0% |
| Sunday | 43°F | Sunny | 3 to 7 mph WNW | 0% |
| Sunday Night | 27°F | Clear | 6 mph WNW | 0% |
| Monday | 45°F | Sunny | 6 mph NW | 0% |
| Monday Night | 28°F | Partly Cloudy | 5 mph SSE | 0% |
| Tuesday | 41°F | Mostly Sunny | 7 mph W | 1% |
| Tuesday Night | 27°F | Partly Cloudy | 5 mph WNW | 3% |
Forecast source: National Weather Service (api.weather.gov) for Keystone (39.574, -105.935). Updated through the day.
Growing snapshot for Keystone
Growing season
41 days
Hardiness zone
5a
More local growing data for Keystone: nearby ZIP 80435 weather · frost dates · planting calendar · Colorado frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Dillon 1 E, Co (6.5 mi from Keystone). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 5, 2026.