Blackhawk, CA Weather & Growing Conditions
Overnight
46°F
Patchy Fog
Patchy fog. Partly cloudy, with a low around 46. North northeast wind around 2 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 46°F | Patchy Fog | 2 mph NNE | 0% |
| Wednesday | 65°F | Patchy Fog then Sunny | 1 to 7 mph NNW | 1% |
| Wednesday Night | 46°F | Mostly Cloudy then Patchy Fog | 2 mph WNW | 2% |
| Thursday | 69°F | Patchy Fog then Mostly Sunny | 0 to 5 mph N | 0% |
| Thursday Night | 46°F | Mostly Clear | 2 mph NNW | 0% |
| Friday | 71°F | Sunny | 0 to 5 mph N | 0% |
| Friday Night | 48°F | Mostly Clear | 0 mph | 0% |
| Saturday | 72°F | Sunny | 0 to 3 mph NNE | 0% |
| Saturday Night | 48°F | Mostly Clear | 1 mph N | 0% |
| Sunday | 72°F | Mostly Sunny | 0 to 3 mph NNW | 0% |
| Sunday Night | 50°F | Partly Cloudy | 1 mph NW | 0% |
| Monday | 70°F | Mostly Sunny | 0 to 3 mph WSW | 1% |
| Monday Night | 48°F | Partly Cloudy | 0 to 3 mph W | 1% |
| Tuesday | 70°F | Sunny | 0 to 3 mph NW | 5% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Blackhawk, CA
Last spring frost
Mar 8
First fall frost
Dec 22
Growing season
282 days
Hardiness zone
9b
Explore more for Blackhawk, CA: full frost dates · planting calendar · California frost dates
Climate data from the nearest NOAA station, Mt Diablo Junction, Ca (5.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.