Boulder, CO Weather & Growing Conditions
Tonight
34°F
Mostly Clear
Mostly clear, with a low around 34. West wind around 3 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 34°F | Mostly Clear | 3 mph W | 0% |
| Wednesday | 55°F | Partly Sunny then Slight Chance Rain Showers | 5 mph N | 17% |
| Wednesday Night | 35°F | Slight Chance Rain Showers then Mostly Cloudy | 1 to 5 mph NNW | 17% |
| Thursday | 58°F | Sunny | 1 to 5 mph SSE | 0% |
| Thursday Night | 36°F | Partly Cloudy | 2 mph WSW | 1% |
| Friday | 56°F | Mostly Sunny then Slight Chance Rain Showers | 1 to 5 mph NNE | 16% |
| Friday Night | 33°F | Slight Chance Rain Showers then Mostly Clear | 5 mph WNW | 16% |
| Saturday | 59°F | Sunny | 2 to 6 mph SE | 1% |
| Saturday Night | 33°F | Mostly Clear | 3 mph SW | 0% |
| Sunday | 65°F | Sunny | 1 to 6 mph S | 0% |
| Sunday Night | 39°F | Mostly Clear | 3 to 9 mph W | 0% |
| Monday | 66°F | Sunny | 1 to 6 mph N | 0% |
| Monday Night | 39°F | Partly Cloudy | 2 mph W | 0% |
| Tuesday | 63°F | Mostly Sunny | 2 mph NNE | 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 (3.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.