Grand Lake, CO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grand Lake, a town in Grand County, Colorado.
This Afternoon
66°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 66, with temperatures falling to around 61 in the afternoon. Southwest wind around 7 mph. Chance of precipitation is 60%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Grand Lake
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 66°F | Chance Showers And Thunderstorms | 7 mph SW | 59% |
| Tonight | 35°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 5 mph S | 25% |
| Saturday | 66°F | Chance Rain Showers then Chance Showers And Thunderstorms | 2 to 9 mph SW | 60% |
| Saturday Night | 31°F | Chance Showers And Thunderstorms | 1 to 10 mph SSW | 32% |
| Sunday | 61°F | Chance Rain Showers then Partly Sunny | 1 to 13 mph W | 34% |
| Sunday Night | 29°F | Partly Cloudy | 0 to 9 mph W | 3% |
| Monday | 66°F | Sunny | 0 to 9 mph W | 1% |
| Monday Night | 31°F | Partly Cloudy | 1 to 7 mph NNE | 1% |
| Tuesday | 69°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 1 to 8 mph WSW | 21% |
| Tuesday Night | 32°F | Slight Chance Rain Showers then Mostly Cloudy | 1 to 5 mph NNE | 23% |
| Wednesday | 67°F | Partly Sunny then Slight Chance Showers And Thunderstorms | 1 to 8 mph W | 24% |
| Wednesday Night | 31°F | Mostly Cloudy | 1 to 5 mph NW | 13% |
| Thursday | 69°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 1 to 7 mph SSW | 19% |
| Thursday Night | 33°F | Slight Chance Rain Showers then Mostly Cloudy | 1 to 6 mph E | 18% |
Forecast source: National Weather Service (api.weather.gov) for Grand Lake (40.256, -105.829). Updated through the day.
Growing snapshot for Grand Lake
Growing season
54 days
Hardiness zone
5a
More local growing data for Grand Lake: nearby ZIP 80447 weather · frost dates · planting calendar · Colorado frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Grand Lake 1 Nw, Co (2.1 mi from Grand Lake). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 18, 2026.