Granby, CO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Granby, a town in Grand County, Colorado.
This Afternoon
68°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 3pm, then showers and thunderstorms likely between 3pm and 4pm, then a chance of showers and thunderstorms. Mostly cloudy. High near 68, with temperatures falling to around 62 in the afternoon. Southwest wind around 7 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Granby
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 68°F | Chance Showers And Thunderstorms | 7 mph SW | 56% |
| Tonight | 37°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 1 to 6 mph SSE | 28% |
| Saturday | 67°F | Chance Rain Showers then Chance Showers And Thunderstorms | 1 to 9 mph WSW | 49% |
| Saturday Night | 32°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 0 to 12 mph SW | 25% |
| Sunday | 62°F | Slight Chance Rain Showers then Mostly Sunny | 0 to 16 mph WNW | 22% |
| Sunday Night | 30°F | Mostly Clear | 0 to 10 mph WSW | 2% |
| Monday | 68°F | Sunny | 0 to 10 mph WNW | 0% |
| Monday Night | 32°F | Mostly Clear | 1 to 9 mph SSE | 0% |
| Tuesday | 70°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 0 to 9 mph W | 24% |
| Tuesday Night | 34°F | Slight Chance Rain Showers then Partly Cloudy | 0 to 7 mph SSE | 19% |
| Wednesday | 68°F | Partly Sunny then Slight Chance Showers And Thunderstorms | 0 to 9 mph WNW | 19% |
| Wednesday Night | 34°F | Mostly Cloudy | 0 to 6 mph SSE | 14% |
| Thursday | 70°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 0 to 8 mph SE | 18% |
| Thursday Night | 35°F | Slight Chance Rain Showers then Mostly Cloudy | 0 to 7 mph ESE | 18% |
Forecast source: National Weather Service (api.weather.gov) for Granby (40.065, -105.919). Updated through the day.
Growing snapshot for Granby
Growing season
32 days
Hardiness zone
5b
More local growing data for Granby: nearby ZIP 80478 weather · frost dates · planting calendar · Colorado frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Fraser, Co (5.9 mi from Granby). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 18, 2026.