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Rock Island, WA Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Rock Island, a city in Chelan County, Washington.

Overnight
57°F
Mostly Clear
Mostly clear. Low around 57, with temperatures rising to around 59 overnight. Northwest wind around 5 mph.

7-day forecast for Rock Island

WhenTempForecastWindPrecip
Overnight 57°F Mostly Clear 5 mph NW 0%
Saturday 82°F Mostly Sunny 2 to 7 mph SW 0%
Saturday Night 58°F Mostly Clear 0 to 5 mph NE 0%
Sunday 83°F Sunny 6 mph E 0%
Sunday Night 58°F Mostly Clear 0 to 5 mph W 0%
Monday 85°F Sunny 1 to 5 mph NW 0%
Monday Night 57°F Partly Cloudy 3 to 8 mph NW 0%
Tuesday 80°F Mostly Sunny 2 to 9 mph W 0%
Tuesday Night 54°F Partly Cloudy 3 to 9 mph W 0%
Wednesday 76°F Mostly Sunny 5 to 9 mph W 0%
Wednesday Night 54°F Mostly Cloudy 5 to 8 mph W 1%
Thursday 73°F Partly Sunny 3 to 7 mph NW 6%
Thursday Night 53°F Mostly Cloudy 3 to 7 mph W 9%
Friday 70°F Mostly Sunny 6 to 10 mph NW 8%

Forecast source: National Weather Service (api.weather.gov) for Rock Island (47.373, -120.142). Updated through the day.

Growing snapshot for Rock Island

Last spring frost
Apr 8
First fall frost
Oct 24
Growing season
200 days
Hardiness zone
7a

More local growing data for Rock Island: nearby ZIP 98828 weather · frost dates · planting calendar · Washington frost dates

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Climate data from the nearest NOAA station, Wenatchee Pangborn Ap, Wa (6.2 mi from Rock Island). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.