Gunbarrel, CO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Gunbarrel, a community in Boulder County, Colorado.
Today
77°F
Patchy Smoke
Patchy smoke and a slight chance of rain showers. Mostly sunny. High near 77, with temperatures falling to around 75 in the afternoon. East northeast wind 5 to 8 mph. Chance of precipitation is 20%.
7-day forecast for Gunbarrel
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 77°F | Patchy Smoke | 5 to 8 mph ENE | 16% |
| Tonight | 53°F | Patchy Smoke | 3 to 8 mph NNE | 10% |
| Wednesday | 85°F | Patchy Smoke | 3 to 8 mph NE | 1% |
| Wednesday Night | 56°F | Mostly Clear | 3 to 7 mph NNW | 1% |
| Thursday | 94°F | Sunny | 2 to 8 mph NNE | 1% |
| Thursday Night | 59°F | Clear | 6 mph WNW | 1% |
| Friday | 97°F | Sunny | 2 to 8 mph S | 0% |
| Friday Night | 61°F | Mostly Clear | 7 mph SSW | 0% |
| Saturday | 99°F | Sunny | 2 to 7 mph N | 2% |
| Saturday Night | 63°F | Partly Cloudy | 3 to 7 mph W | 0% |
| Sunday | 97°F | Sunny | 3 to 8 mph NNE | 8% |
| Sunday Night | 65°F | Partly Cloudy | 8 mph W | 4% |
| Monday | 96°F | Mostly Sunny then Chance Showers And Thunderstorms | 6 to 10 mph N | 26% |
| Monday Night | 64°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 3 to 10 mph W | 17% |
Forecast source: National Weather Service (api.weather.gov) for Gunbarrel (40.063, -105.172). Updated through the day.
Growing snapshot for Gunbarrel
Last spring frost
May 6
First fall frost
Oct 5
Growing season
151 days
Hardiness zone
6a
More local growing data for Gunbarrel: nearby ZIP 80301 weather · frost dates · planting calendar · Colorado frost dates
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Climate data from the nearest NOAA station, Boulder, Co (5.1 mi from Gunbarrel). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.