Boulder, CO Weather & Growing Conditions
Overnight
55°F
Partly Cloudy
Partly cloudy, with a low around 55. West southwest wind around 2 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 55°F | Partly Cloudy | 2 mph WSW | 3% |
| Saturday | 75°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 2 to 6 mph N | 58% |
| Saturday Night | 50°F | Chance Showers And Thunderstorms then Partly Cloudy | 1 to 5 mph WSW | 30% |
| Sunday | 71°F | Partly Sunny then Chance Showers And Thunderstorms | 0 to 5 mph NNE | 29% |
| Sunday Night | 49°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 3 mph NNE | 28% |
| Monday | 72°F | Sunny | 0 to 6 mph ENE | 4% |
| Monday Night | 51°F | Partly Cloudy | 0 to 5 mph NNE | 11% |
| Tuesday | 75°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 0 to 5 mph ESE | 18% |
| Tuesday Night | 52°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 0 to 3 mph NW | 23% |
| Wednesday | 77°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 0 to 5 mph NNE | 21% |
| Wednesday Night | 53°F | Partly Cloudy | 3 mph NW | 14% |
| Thursday | 78°F | Mostly Sunny | 2 to 6 mph SSE | 11% |
| Thursday Night | 55°F | Partly Cloudy | 0 to 5 mph SW | 13% |
| Friday | 79°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 0 to 5 mph SSE | 20% |
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 Sep 19, 2026.