Ahtanum, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Ahtanum, a community in Yakima County, Washington.
Overnight
49°F
Mostly Clear
Mostly clear. Low around 49, with temperatures rising to around 51 overnight. Northwest wind around 3 mph.
7-day forecast for Ahtanum
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 49°F | Mostly Clear | 3 mph NW | 0% |
| Saturday | 80°F | Sunny | 1 to 6 mph SE | 0% |
| Saturday Night | 50°F | Mostly Clear | 3 mph NW | 0% |
| Sunday | 81°F | Sunny | 5 mph NE | 0% |
| Sunday Night | 50°F | Mostly Clear | 3 mph NW | 0% |
| Monday | 82°F | Sunny | 1 to 5 mph N | 0% |
| Monday Night | 50°F | Partly Cloudy | 6 mph NW | 0% |
| Tuesday | 78°F | Mostly Sunny | 1 to 6 mph NE | 0% |
| Tuesday Night | 48°F | Partly Cloudy | 7 mph NW | 0% |
| Wednesday | 73°F | Mostly Sunny | 2 to 7 mph NE | 1% |
| Wednesday Night | 46°F | Mostly Cloudy | 6 mph NW | 1% |
| Thursday | 70°F | Mostly Sunny | 5 mph NE | 5% |
| Thursday Night | 46°F | Mostly Cloudy | 5 mph N | 8% |
| Friday | 67°F | Mostly Sunny | 3 to 7 mph N | 5% |
Forecast source: National Weather Service (api.weather.gov) for Ahtanum (46.557, -120.614). Updated through the day.
Growing snapshot for Ahtanum
Last spring frost
Apr 8
First fall frost
Oct 23
Growing season
196 days
Hardiness zone
7a
More local growing data for Ahtanum: nearby ZIP 98902 weather · frost dates · planting calendar · Washington frost dates
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Climate data from the nearest NOAA station, Yakima #2, Wa (1.8 mi from Ahtanum). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.