Roslyn, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Roslyn, a city in Kittitas County, Washington.
This Afternoon
43°F
Slight Chance Rain Showers
A slight chance of rain showers before 4pm. Partly sunny. High near 43, with temperatures falling to around 40 in the afternoon. East wind 3 to 8 mph. Chance of precipitation is 20%.
7-day forecast for Roslyn
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 43°F | Slight Chance Rain Showers | 3 to 8 mph E | 15% |
| Tonight | 34°F | Partly Cloudy | 3 mph NW | 7% |
| Wednesday | 45°F | Sunny | 2 mph W | 6% |
| Wednesday Night | 37°F | Rain Showers | 1 to 6 mph W | 95% |
| Thursday | 40°F | Slight Chance Rain Showers then Partly Sunny | 2 to 7 mph W | 20% |
| Thursday Night | 35°F | Rain Showers Likely | 2 mph W | 74% |
| Friday | 41°F | Rain Showers Likely | 2 mph W | 74% |
| Friday Night | 39°F | Chance Rain Showers | 1 mph SW | 32% |
| Saturday | 45°F | Partly Sunny | 1 to 5 mph E | 12% |
| Saturday Night | 38°F | Rain Showers Likely | 5 mph S | 73% |
| Sunday | 41°F | Rain Showers Likely | 2 to 6 mph W | 73% |
| Sunday Night | 35°F | Slight Chance Rain Showers then Mostly Cloudy | 2 mph NW | 15% |
| Monday | 41°F | Chance Rain Showers | 2 mph E | 46% |
| Monday Night | 37°F | Rain Showers Likely | 1 mph E | 55% |
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
Nearby towns & communities
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 Nov 4, 2026.