Blackhawk, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Blackhawk, a community in Contra Costa County, California.
Overnight
60°F
Mostly Clear
Mostly clear, with a low around 60. West wind around 2 mph.
7-day forecast for Blackhawk
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 60°F | Mostly Clear | 2 mph W | 0% |
| Tuesday | 99°F | Sunny | 2 to 8 mph WSW | 0% |
| Tuesday Night | 59°F | Mostly Clear | 2 to 7 mph W | 0% |
| Wednesday | 95°F | Sunny | 2 to 7 mph WSW | 0% |
| Wednesday Night | 58°F | Mostly Clear | 2 to 7 mph WSW | 0% |
| Thursday | 92°F | Sunny | 2 to 8 mph WSW | 0% |
| Thursday Night | 60°F | Mostly Clear | 2 to 8 mph WSW | 0% |
| Friday | 96°F | Sunny | 2 to 8 mph WSW | 0% |
| Friday Night | 62°F | Mostly Clear | 2 to 8 mph WSW | 0% |
| Saturday | 96°F | Sunny | 2 to 9 mph WSW | 0% |
| Saturday Night | 62°F | Mostly Clear | 3 to 9 mph SW | 0% |
| Sunday | 89°F | Sunny | 3 to 9 mph SW | 0% |
| Sunday Night | 58°F | Mostly Clear | 9 mph SW | 0% |
| Monday | 84°F | Sunny | 7 to 10 mph SW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Blackhawk (37.810, -121.913). Updated through the day.
Growing snapshot for Blackhawk
Last spring frost
Mar 8
First fall frost
Dec 22
Growing season
282 days
Hardiness zone
9b
More local growing data for Blackhawk: nearby ZIP 94506 weather · frost dates · planting calendar · California frost dates
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Climate data from the nearest NOAA station, Mt Diablo Junction, Ca (5.3 mi from Blackhawk). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.