Castle Rock, CO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Castle Rock, a town in Douglas County, Colorado.
Tonight
32°F
Mostly Clear
Mostly clear, with a low around 32. South wind around 5 mph.
7-day forecast for Castle Rock
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 32°F | Mostly Clear | 5 mph S | 0% |
| Wednesday | 55°F | Mostly Sunny then Chance Rain Showers | 2 to 8 mph NNE | 39% |
| Wednesday Night | 34°F | Chance Rain Showers then Mostly Cloudy | 5 mph NNW | 50% |
| Thursday | 55°F | Sunny | 3 mph N | 0% |
| Thursday Night | 34°F | Partly Cloudy | 2 to 7 mph S | 1% |
| Friday | 55°F | Mostly Sunny | 2 to 6 mph NW | 9% |
| Friday Night | 33°F | Mostly Clear | 3 mph W | 9% |
| Saturday | 58°F | Sunny | 5 mph NNW | 2% |
| Saturday Night | 33°F | Clear | 2 to 7 mph S | 2% |
| Sunday | 68°F | Sunny | 3 to 8 mph S | 0% |
| Sunday Night | 39°F | Mostly Clear | 6 mph SSW | 0% |
| Monday | 66°F | Sunny | 6 mph SSE | 0% |
| Monday Night | 40°F | Partly Cloudy | 7 mph S | 0% |
| Tuesday | 64°F | Mostly Sunny | 5 mph NNW | 6% |
Forecast source: National Weather Service (api.weather.gov) for Castle Rock (39.376, -104.853). Updated through the day.
Growing snapshot for Castle Rock
Last spring frost
May 9
First fall frost
Oct 2
Growing season
143 days
Hardiness zone
5b
More local growing data for Castle Rock: nearby ZIP 80109 weather · frost dates · planting calendar · Colorado frost dates
Nearby towns & communities
Acres Green
Castle Pines
Castle Pines Village
Franktown
Highlands Ranch
Larkspur
Lone Tree
Louviers
Parker
Perry Park
Roxborough Park
Sedalia
Sierra Ridge
Stepping Stone
Sterling Ranch
Stonegate
The Pinery
Westcreek
Climate data from the nearest NOAA station, Castle Rock, Co (2.7 mi from Castle Rock). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.