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
52°F
Partly Cloudy
Partly cloudy, with a low around 52. West southwest wind around 3 mph.
7-day forecast for Castle Rock
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 52°F | Partly Cloudy | 3 mph WSW | 1% |
| Saturday | 75°F | Mostly Sunny then Chance Showers And Thunderstorms | 2 to 8 mph SSW | 53% |
| Saturday Night | 49°F | Chance Showers And Thunderstorms then Partly Cloudy | 2 to 6 mph SSE | 45% |
| Sunday | 70°F | Mostly Sunny then Chance Showers And Thunderstorms | 2 to 9 mph NW | 42% |
| Sunday Night | 48°F | Chance Showers And Thunderstorms | 1 to 7 mph WSW | 38% |
| Monday | 71°F | Mostly Sunny | 1 to 9 mph SE | 6% |
| Monday Night | 50°F | Chance Showers And Thunderstorms | 8 to 12 mph SSE | 30% |
| Tuesday | 74°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 3 to 12 mph SSE | 19% |
| Tuesday Night | 51°F | Slight Chance Showers And Thunderstorms then Mostly Cloudy | 8 to 12 mph S | 19% |
| Wednesday | 75°F | Partly Sunny then Slight Chance Showers And Thunderstorms | 3 to 7 mph S | 16% |
| Wednesday Night | 51°F | Slight Chance Showers And Thunderstorms then Mostly Cloudy | 2 to 6 mph SSW | 19% |
| Thursday | 75°F | Mostly Sunny | 2 to 7 mph ESE | 12% |
| Thursday Night | 53°F | Slight Chance Rain Showers then Mostly Cloudy | 8 mph SSE | 19% |
| Friday | 76°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 6 to 10 mph SSE | 20% |
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 Sep 19, 2026.