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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.

Overnight
47°F
Partly Cloudy
Partly cloudy, with a low around 47. West wind around 7 mph.

7-day forecast for Roslyn

WhenTempForecastWindPrecip
Overnight 47°F Partly Cloudy 7 mph W 0%
Saturday 67°F Mostly Sunny 1 to 5 mph W 0%
Saturday Night 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%

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.