Boulder, CO Weather & Growing Conditions
This Afternoon
56°F
Sunny
Sunny. High near 56, with temperatures falling to around 50 in the afternoon. East wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 56°F | Sunny | 5 mph E | 0% |
| Tonight | 34°F | Mostly Clear | 3 mph WSW | 0% |
| Wednesday | 55°F | Partly Sunny | 0 to 5 mph NE | 14% |
| Wednesday Night | 33°F | Mostly Cloudy | 2 mph WNW | 14% |
| Thursday | 59°F | Sunny | 0 to 5 mph SSE | 0% |
| Thursday Night | 36°F | Partly Cloudy | 0 to 3 mph W | 1% |
| Friday | 58°F | Mostly Sunny | 1 to 5 mph E | 14% |
| Friday Night | 34°F | Partly Cloudy | 2 to 6 mph SW | 14% |
| Saturday | 60°F | Sunny | 0 to 7 mph NNW | 1% |
| Saturday Night | 34°F | Mostly Clear | 1 to 5 mph W | 1% |
| Sunday | 68°F | Sunny | 2 to 6 mph S | 0% |
| Sunday Night | 43°F | Mostly Clear | 6 to 10 mph W | 0% |
| Monday | 67°F | Mostly Sunny | 1 to 7 mph ENE | 0% |
| Monday Night | 41°F | Partly Cloudy | 3 mph WNW | 0% |
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 (3.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.