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Roslyn, WA Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Roslyn, a city in Kittitas County, Washington.

Today
67°F
Mostly Sunny
Mostly sunny. High near 67, with temperatures falling to around 65 in the afternoon. West wind 1 to 5 mph.

7-day forecast for Roslyn

WhenTempForecastWindPrecip
Today 67°F Mostly Sunny 1 to 5 mph W 0%
Tonight 51°F Mostly Clear 3 mph NW 0%
Sunday 68°F Sunny 3 mph E 0%
Sunday Night 52°F Mostly Clear 3 mph NW 0%
Monday 64°F Sunny 3 to 8 mph W 0%
Monday Night 47°F Partly Cloudy 10 mph W 0%
Tuesday 59°F Mostly Sunny 7 to 10 mph W 0%
Tuesday Night 43°F Mostly Cloudy 7 mph W 0%
Wednesday 56°F Partly Sunny 6 mph W 0%
Wednesday Night 44°F Mostly Cloudy 2 to 6 mph W 3%
Thursday 55°F Partly Sunny then Slight Chance Rain Showers 5 mph W 15%
Thursday Night 43°F Slight Chance Rain Showers 5 mph W 16%
Friday 53°F Partly Sunny 6 mph W 14%
Friday Night 41°F Partly Cloudy 6 mph W 11%

Forecast source: National Weather Service (api.weather.gov) for Roslyn (47.270, -121.141). Updated through the day.

Growing snapshot for Roslyn

Last spring frost
May 14
First fall frost
Oct 17
Growing season
154 days
Hardiness zone
7a

More local growing data for Roslyn: nearby ZIP 98925 weather · frost dates · planting calendar · Washington frost dates

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Climate data from the nearest NOAA station, Stampede Pass, Wa (2.8 mi from Roslyn). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.