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
57°F
Patchy Smoke
Patchy smoke. Mostly cloudy. Low around 57, with temperatures rising to around 59 overnight. North wind around 10 mph, with gusts as high as 16 mph.
7-day forecast for Castle Rock
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 57°F | Patchy Smoke | 10 mph N | 9% |
| Tuesday | 79°F | Patchy Smoke | 6 to 12 mph ENE | 28% |
| Tuesday Night | 56°F | Patchy Smoke | 5 to 13 mph S | 15% |
| Wednesday | 86°F | Patchy Smoke then Sunny | 3 to 9 mph N | 1% |
| Wednesday Night | 59°F | Mostly Clear | 8 to 12 mph SSE | 8% |
| Thursday | 93°F | Sunny | 3 to 8 mph NW | 1% |
| Thursday Night | 61°F | Clear | 8 mph S | 4% |
| Friday | 95°F | Sunny | 3 to 8 mph N | 0% |
| Friday Night | 64°F | Mostly Clear | 8 to 13 mph SSE | 1% |
| Saturday | 96°F | Sunny | 6 to 10 mph NW | 0% |
| Saturday Night | 65°F | Partly Cloudy | 7 to 13 mph SSE | 1% |
| Sunday | 96°F | Sunny | 3 to 8 mph NNW | 8% |
| Sunday Night | 66°F | Partly Cloudy | 6 to 9 mph SSW | 5% |
| Monday | 95°F | Sunny | 5 to 8 mph NW | 12% |
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 Aug 4, 2026.