Deer Park, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Deer Park, a community in Napa County, California.
This Afternoon
56°F
Light Rain
Rain before 5pm, then a chance of rain and patchy fog. Mostly cloudy. High near 56, with temperatures falling to around 54 in the afternoon. East wind around 2 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Deer Park
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 56°F | Light Rain | 2 mph E | 75% |
| Tonight | 43°F | Chance Light Rain then Mostly Cloudy | 3 mph NE | 46% |
| Wednesday | 67°F | Sunny | 3 mph NW | 1% |
| Wednesday Night | 43°F | Partly Cloudy | 2 mph NW | 0% |
| Thursday | 72°F | Patchy Fog then Sunny | 2 mph NNW | 0% |
| Thursday Night | 45°F | Mostly Clear | 1 mph N | 0% |
| Friday | 74°F | Sunny | 0 mph | 0% |
| Friday Night | 46°F | Mostly Clear | 0 mph | 0% |
| Saturday | 74°F | Sunny | 1 mph NE | 0% |
| Saturday Night | 46°F | Mostly Clear | 1 mph N | 0% |
| Sunday | 73°F | Mostly Sunny | 2 mph N | 0% |
| Sunday Night | 47°F | Mostly Cloudy | 0 mph | 0% |
| Monday | 71°F | Partly Sunny | 1 mph SW | 2% |
| Monday Night | 46°F | Partly Cloudy | 0 mph | 3% |
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.