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Loon Lake, WA Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Loon Lake, a community in Stevens County, Washington.

This Afternoon
76°F
Sunny
Sunny, with a high near 76. Southwest wind around 2 mph.

7-day forecast for Loon Lake

WhenTempForecastWindPrecip
This Afternoon 76°F Sunny 2 mph SW 0%
Tonight 50°F Mostly Clear 1 mph E 0%
Sunday 78°F Sunny 0 to 3 mph SE 0%
Sunday Night 50°F Mostly Clear 2 mph E 0%
Monday 79°F Sunny 3 mph SE 0%
Monday Night 51°F Partly Cloudy 2 mph N 0%
Tuesday 77°F Mostly Sunny 0 to 5 mph S 0%
Tuesday Night 50°F Partly Cloudy 1 to 5 mph S 0%
Wednesday 69°F Mostly Sunny 1 to 7 mph S 0%
Wednesday Night 47°F Partly Cloudy 0 to 6 mph S 4%
Thursday 67°F Partly Sunny 0 to 5 mph SE 7%
Thursday Night 47°F Mostly Cloudy 3 mph N 13%
Friday 65°F Partly Sunny then Slight Chance Rain Showers 5 mph W 19%
Friday Night 45°F Slight Chance Rain Showers 5 mph NW 19%

Forecast source: National Weather Service (api.weather.gov) for Loon Lake (48.070, -117.626). Updated through the day.

Growing snapshot for Loon Lake

Last spring frost
May 22
First fall frost
Sep 14
Growing season
112 days
Hardiness zone
6a

More local growing data for Loon Lake: nearby ZIP 99148 weather · frost dates · planting calendar · Washington frost dates

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Climate data from the nearest NOAA station, Deer Park Ap, Wa (11.3 mi from Loon Lake). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.