Boulder, CO Weather & Growing Conditions
This Afternoon
56°F
Mostly Cloudy
Mostly cloudy. High near 56, with temperatures falling to around 49 in the afternoon. Northeast wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 56°F | Mostly Cloudy | 5 mph NE | 9% |
| Tonight | 35°F | Mostly Cloudy | 3 mph NW | 9% |
| Thursday | 58°F | Sunny | 1 to 5 mph SE | 0% |
| Thursday Night | 35°F | Mostly Cloudy | 2 mph WSW | 0% |
| Friday | 56°F | Partly Sunny | 0 to 3 mph N | 11% |
| Friday Night | 33°F | Mostly Clear | 3 mph WNW | 9% |
| Saturday | 60°F | Sunny | 0 to 6 mph S | 0% |
| Saturday Night | 33°F | Mostly Clear | 3 mph W | 0% |
| Sunday | 65°F | Sunny | 1 to 5 mph S | 0% |
| Sunday Night | 39°F | Mostly Clear | 3 to 9 mph WSW | 0% |
| Monday | 67°F | Sunny | 0 to 7 mph SE | 0% |
| Monday Night | 39°F | Partly Cloudy | 2 mph W | 0% |
| Tuesday | 63°F | Mostly Sunny | 2 mph N | 1% |
| Tuesday Night | 40°F | Partly Cloudy | 3 mph W | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Boulder, CO
Last spring frost
May 6
First fall frost
Oct 5
Growing season
151 days
Hardiness zone
6a
Explore more for Boulder, CO: full frost dates · planting calendar · Colorado frost dates
Climate data from the nearest NOAA station, Boulder, Co (1.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.