Hartline, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Hartline, a town in Grant County, Washington.
Today
87°F
Patchy Smoke
Patchy smoke. Sunny, with a high near 87. North wind 5 to 12 mph.
7-day forecast for Hartline
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Patchy Smoke | 5 to 12 mph N | 0% |
| Tonight | 59°F | Patchy Smoke then Haze | 6 mph N | 0% |
| Wednesday | 93°F | Areas Of Smoke | 8 mph SE | 0% |
| Wednesday Night | 62°F | Areas Of Smoke then Mostly Clear | 7 mph E | 0% |
| Thursday | 97°F | Sunny | 6 to 10 mph S | 0% |
| Thursday Night | 66°F | Mostly Clear | 6 to 9 mph W | 0% |
| Friday | 97°F | Sunny | 6 to 17 mph W | 0% |
| Friday Night | 64°F | Mostly Clear | 9 to 17 mph W | 0% |
| Saturday | 92°F | Sunny | 8 to 15 mph W | 0% |
| Saturday Night | 61°F | Mostly Clear | 12 to 16 mph W | 0% |
| Sunday | 89°F | Sunny | 8 to 12 mph W | 0% |
| Sunday Night | 59°F | Mostly Clear | 10 mph W | 0% |
| Monday | 87°F | Sunny | 9 mph W | 0% |
| Monday Night | 59°F | Mostly Clear | 9 mph W | 0% |
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 Aug 4, 2026.