Hartline, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Hartline, a town in Grant County, Washington.
Tonight
52°F
Mostly Clear
Mostly clear, with a low around 52. Northwest wind around 5 mph.
7-day forecast for Hartline
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 52°F | Mostly Clear | 5 mph NW | 0% |
| Saturday | 78°F | Mostly Sunny | 7 mph SE | 0% |
| Saturday Night | 53°F | Partly Cloudy | 6 mph SE | 0% |
| Sunday | 80°F | Sunny | 7 mph SE | 0% |
| Sunday Night | 54°F | Mostly Clear | 3 to 7 mph SW | 0% |
| Monday | 80°F | Sunny | 5 to 9 mph S | 0% |
| Monday Night | 53°F | Partly Cloudy | 6 to 9 mph W | 0% |
| Tuesday | 75°F | Mostly Sunny | 5 to 9 mph SW | 0% |
| Tuesday Night | 51°F | Partly Cloudy | 6 to 9 mph W | 0% |
| Wednesday | 71°F | Mostly Sunny | 8 mph W | 0% |
| Wednesday Night | 51°F | Partly Cloudy | 8 mph NE | 1% |
| Thursday | 75°F | Mostly Sunny | 8 mph E | 3% |
| Thursday Night | 52°F | Mostly Cloudy | 7 to 10 mph NW | 8% |
| Friday | 70°F | Partly Sunny | 13 mph W | 8% |
Forecast source: National Weather Service (api.weather.gov) for Hartline (47.689, -119.108). Updated through the day.
Growing snapshot for Hartline
Last spring frost
May 2
First fall frost
Oct 12
Growing season
162 days
Hardiness zone
6b
More local growing data for Hartline: nearby ZIP 99135 weather · frost dates · planting calendar · Washington frost dates
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Climate data from the nearest NOAA station, Hartline, Wa (2.1 mi from Hartline). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.