Boulder, CO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Boulder, a city in Boulder County, Colorado.
This Afternoon
56°F
Sunny
Sunny. High near 56, with temperatures falling to around 51 in the afternoon. East northeast wind around 6 mph.
7-day forecast for Boulder
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 56°F | Sunny | 6 mph ENE | 0% |
| Tonight | 34°F | Mostly Clear | 3 mph SW | 0% |
| Wednesday | 55°F | Partly Sunny | 0 to 5 mph NE | 12% |
| Wednesday Night | 34°F | Mostly Cloudy | 2 mph NW | 12% |
| Thursday | 59°F | Sunny | 1 to 5 mph SSE | 0% |
| Thursday Night | 36°F | Partly Cloudy | 2 mph SW | 1% |
| Friday | 58°F | Mostly Sunny | 1 to 5 mph E | 13% |
| Friday Night | 34°F | Mostly Clear | 5 mph SW | 13% |
| Saturday | 60°F | Sunny | 1 to 6 mph S | 1% |
| Saturday Night | 34°F | Mostly Clear | 5 mph W | 1% |
| Sunday | 68°F | Sunny | 5 mph SSW | 0% |
| Sunday Night | 42°F | Mostly Clear | 3 to 9 mph W | 0% |
| Monday | 67°F | Mostly Sunny | 1 to 6 mph ENE | 0% |
| Monday Night | 41°F | Partly Cloudy | 2 mph WNW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Boulder (40.024, -105.251). Updated through the day.
Growing snapshot for Boulder
Last spring frost
May 6
First fall frost
Oct 5
Growing season
151 days
Hardiness zone
6a
More local growing data for Boulder: nearby ZIP 80310 weather · frost dates · planting calendar · Colorado frost dates
Nearby towns & communities
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Bonanza Mountain Estates
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Crisman
Eldorado Springs
Glendale
Gold Hill
Gunbarrel
Hidden Lake
Jamestown
Lafayette
Lazy Acres
Leyner
Longmont
Louisville
Lyons
Mountain Meadows
Nederland
Niwot
Paragon Estates
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St. Ann Highlands
Sugarloaf
Sunshine
Superior
Tall Timber
Valmont
Climate data from the nearest NOAA station, Boulder, Co (0.9 mi from Boulder). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.