Deer Park, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Deer Park, a community in Napa County, California.
Overnight
43°F
Mostly Clear
Mostly clear, with a low around 43. North northeast wind around 2 mph.
7-day forecast for Deer Park
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 43°F | Mostly Clear | 2 mph NNE | 0% |
| Wednesday | 67°F | Sunny | 1 to 5 mph NNW | 2% |
| Wednesday Night | 43°F | Mostly Cloudy | 2 mph NW | 2% |
| Thursday | 72°F | Patchy Fog then Mostly Sunny | 2 mph NNW | 0% |
| Thursday Night | 43°F | Mostly Clear | 1 mph N | 0% |
| Friday | 75°F | Sunny | 1 mph N | 0% |
| Friday Night | 45°F | Mostly Clear | 0 mph | 0% |
| Saturday | 74°F | Sunny | 1 mph NE | 0% |
| Saturday Night | 45°F | Mostly Clear | 1 mph N | 0% |
| Sunday | 74°F | Mostly Sunny | 2 mph N | 0% |
| Sunday Night | 46°F | Partly Cloudy | 0 mph | 0% |
| Monday | 71°F | Mostly Sunny | 0 mph | 2% |
| Monday Night | 46°F | Partly Cloudy | 0 mph | 3% |
| Tuesday | 71°F | Sunny | 1 mph SW | 8% |
Forecast source: National Weather Service (api.weather.gov) for Deer Park (38.535, -122.470). Updated through the day.
Growing snapshot for Deer Park
Last spring frost
Apr 7
First fall frost
Dec 5
Growing season
245 days
Hardiness zone
9b
More local growing data for Deer Park: nearby ZIP 94576 weather · frost dates · planting calendar · California frost dates
Nearby towns & communities
American Canyon
Angwin
Moskowite Corner
Napa
Oakville
Rutherford
Silverado Resort
St. Helena
Yountville
Climate data from the nearest NOAA station, Angwin Pacific Union College, Ca (2.5 mi from Deer Park). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.