Castle Rock, CO Weather & Growing Conditions
Today
78°F
Patchy Smoke
Patchy smoke before noon, then patchy smoke and a chance of showers and thunderstorms. Mostly sunny. High near 78, with temperatures falling to around 71 in the afternoon. East wind 6 to 12 mph, with gusts as high as 18 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 | 78°F | Patchy Smoke | 6 to 12 mph E | 34% |
| Tonight | 55°F | Patchy Smoke then Partly Cloudy | 8 to 14 mph S | 15% |
| Wednesday | 83°F | Sunny | 3 to 10 mph NNE | 3% |
| Wednesday Night | 58°F | Mostly Clear | 9 to 15 mph SSE | 9% |
| Thursday | 90°F | Sunny | 5 to 12 mph NNW | 2% |
| Thursday Night | 59°F | Clear | 6 to 10 mph S | 5% |
| Friday | 92°F | Sunny | 5 to 9 mph NNE | 0% |
| Friday Night | 62°F | Mostly Clear | 9 to 15 mph S | 1% |
| Saturday | 93°F | Sunny | 6 to 12 mph NNW | 1% |
| Saturday Night | 64°F | Partly Cloudy | 8 to 13 mph S | 1% |
| Sunday | 93°F | Sunny | 3 to 7 mph SSE | 9% |
| Sunday Night | 64°F | Partly Cloudy | 7 to 10 mph SSW | 5% |
| Monday | 92°F | Sunny | 8 mph NW | 14% |
| Monday Night | 63°F | Partly Cloudy | 5 to 8 mph SW | 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 (8.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.