Castle Rock, CO Weather & Growing Conditions
Today
80°F
Patchy Smoke
Patchy smoke before noon, then patchy smoke and a chance of showers and thunderstorms. Mostly sunny. High near 80, with temperatures falling to around 73 in the afternoon. East wind 6 to 10 mph, with gusts as high as 16 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 80°F | Patchy Smoke | 6 to 10 mph E | 28% |
| Tonight | 57°F | Patchy Smoke | 3 to 12 mph S | 15% |
| Wednesday | 86°F | Patchy Smoke then Sunny | 2 to 10 mph NNE | 1% |
| Wednesday Night | 60°F | Mostly Clear | 8 to 12 mph S | 8% |
| Thursday | 93°F | Sunny | 3 to 9 mph N | 2% |
| Thursday Night | 62°F | Clear | 6 to 9 mph S | 4% |
| Friday | 95°F | Sunny | 3 to 9 mph NNE | 0% |
| Friday Night | 64°F | Mostly Clear | 9 to 14 mph SSE | 1% |
| Saturday | 97°F | Sunny | 6 to 12 mph NNW | 0% |
| Saturday Night | 66°F | Mostly Clear | 7 to 13 mph SSE | 1% |
| Sunday | 96°F | Sunny | 3 to 8 mph NNE | 9% |
| Sunday Night | 66°F | Partly Cloudy | 6 to 10 mph SSW | 4% |
| Monday | 95°F | Sunny | 5 to 9 mph NW | 13% |
| Monday Night | 65°F | Partly Cloudy | 5 to 8 mph WSW | 12% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Castle Rock, CO
Last spring frost
May 9
First fall frost
Oct 2
Growing season
143 days
Hardiness zone
5b
Explore more for Castle Rock, CO: full frost dates · planting calendar · Colorado frost dates
Climate data from the nearest NOAA station, Castle Rock, Co (2.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.