Boulder, CO Weather & Growing Conditions
Overnight
35°F
Mostly Cloudy
Mostly cloudy, with a low around 35. West wind around 3 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 35°F | Mostly Cloudy | 3 mph W | 0% |
| Wednesday | 55°F | Partly Sunny then Slight Chance Rain Showers | 1 to 5 mph NNE | 18% |
| Wednesday Night | 35°F | Slight Chance Rain Showers then Mostly Cloudy | 1 to 5 mph NW | 18% |
| Thursday | 58°F | Sunny | 0 to 5 mph SE | 0% |
| Thursday Night | 37°F | Partly Cloudy | 2 mph WSW | 1% |
| Friday | 57°F | Slight Chance Rain Showers | 3 mph NNE | 18% |
| Friday Night | 33°F | Slight Chance Rain Showers then Partly Cloudy | 5 mph WNW | 18% |
| Saturday | 59°F | Sunny | 1 to 6 mph S | 1% |
| Saturday Night | 34°F | Mostly Clear | 3 mph WSW | 0% |
| Sunday | 66°F | Sunny | 1 to 6 mph S | 0% |
| Sunday Night | 40°F | Mostly Clear | 3 to 10 mph W | 0% |
| Monday | 67°F | Sunny | 0 to 6 mph NNE | 0% |
| Monday Night | 40°F | Partly Cloudy | 2 mph WNW | 0% |
| Tuesday | 64°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 (3.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.