Hartline, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Hartline, a town in Grant County, Washington.
Tonight
36°F
Partly Cloudy
Partly cloudy, with a low around 36. North wind around 6 mph.
7-day forecast for Hartline
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 36°F | Partly Cloudy | 6 mph N | 1% |
| Wednesday | 53°F | Sunny | 7 mph S | 2% |
| Wednesday Night | 38°F | Chance Rain Showers | 6 mph E | 41% |
| Thursday | 54°F | Mostly Sunny | 5 mph S | 8% |
| Thursday Night | 36°F | Partly Cloudy | 5 to 9 mph SE | 7% |
| Friday | 52°F | Mostly Cloudy | 7 to 10 mph SE | 7% |
| Friday Night | 37°F | Mostly Cloudy | 6 to 10 mph SE | 9% |
| Saturday | 58°F | Partly Sunny | 6 to 10 mph E | 5% |
| Saturday Night | 40°F | Mostly Cloudy then Slight Chance Rain Showers | 6 to 14 mph SE | 15% |
| Sunday | 58°F | Slight Chance Rain Showers then Partly Sunny | 10 to 17 mph SW | 15% |
| Sunday Night | 37°F | Mostly Cloudy | 7 to 10 mph NW | 2% |
| Monday | 55°F | Partly Sunny then Slight Chance Rain Showers | 3 to 10 mph NE | 15% |
| Monday Night | 37°F | Chance Rain Showers | 3 to 8 mph NE | 25% |
| Tuesday | 56°F | Chance Rain Showers | 6 to 10 mph SE | 25% |
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 Nov 4, 2026.