Crestline, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Crestline, a community in San Bernardino County, California.
Tonight
41°F
Mostly Clear
Mostly clear, with a low around 41. South wind 5 to 10 mph.
7-day forecast for Crestline
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 41°F | Mostly Clear | 5 to 10 mph S | 0% |
| Wednesday | 56°F | Sunny | 5 to 10 mph N | 0% |
| Wednesday Night | 44°F | Mostly Clear | 5 to 15 mph N | 0% |
| Thursday | 59°F | Sunny | 0 to 15 mph N | 0% |
| Thursday Night | 47°F | Mostly Clear | 5 to 20 mph N | 0% |
| Friday | 61°F | Sunny | 5 to 20 mph N | 0% |
| Friday Night | 47°F | Clear | 5 to 20 mph N | 0% |
| Saturday | 63°F | Sunny | 0 to 20 mph N | 0% |
| Saturday Night | 48°F | Clear | 0 to 15 mph N | 0% |
| Sunday | 64°F | Sunny | 0 to 15 mph N | 0% |
| Sunday Night | 51°F | Partly Cloudy | 0 to 10 mph NE | 0% |
| Monday | 63°F | Mostly Sunny | 0 to 10 mph S | 0% |
| Monday Night | 50°F | Partly Cloudy | 0 to 5 mph E | 1% |
| Tuesday | 61°F | Mostly Sunny | 0 to 5 mph W | 2% |
Forecast source: National Weather Service (api.weather.gov) for Crestline (34.254, -117.287). Updated through the day.
Growing snapshot for Crestline
Last spring frost
May 5
First fall frost
Nov 2
Growing season
176 days
Hardiness zone
8b
More local growing data for Crestline: nearby ZIP 92325 weather · frost dates · planting calendar · California frost dates
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Climate data from the nearest NOAA station, Lake Arrowhead, Ca (5 mi from Crestline). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.