Castle Rock, CO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Castle Rock, a town in Douglas County, Colorado.
Overnight
33°F
Partly Cloudy
Partly cloudy. Low around 33, with temperatures rising to around 35 overnight. South southwest wind around 5 mph.
7-day forecast for Castle Rock
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 33°F | Partly Cloudy | 5 mph SSW | 0% |
| Wednesday | 55°F | Partly Sunny then Chance Rain Showers | 3 to 8 mph ESE | 35% |
| Wednesday Night | 34°F | Chance Rain Showers then Slight Chance Snow Showers | 2 to 7 mph NNW | 35% |
| Thursday | 56°F | Sunny | 3 mph NNW | 0% |
| Thursday Night | 35°F | Partly Cloudy | 2 to 8 mph S | 0% |
| Friday | 55°F | Mostly Sunny | 2 to 6 mph WNW | 7% |
| Friday Night | 33°F | Mostly Clear | 3 mph W | 7% |
| Saturday | 57°F | Sunny | 5 mph N | 2% |
| Saturday Night | 34°F | Mostly Clear | 2 to 7 mph S | 0% |
| Sunday | 66°F | Sunny | 1 to 9 mph S | 0% |
| Sunday Night | 38°F | Mostly Clear | 7 mph SSW | 0% |
| Monday | 65°F | Sunny | 3 mph N | 0% |
| Monday Night | 39°F | Partly Cloudy | 3 mph S | 0% |
| Tuesday | 64°F | Mostly Sunny | 3 mph SSW | 0% |
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.