Roslyn, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Roslyn, a city in Kittitas County, Washington.
Overnight
50°F
Smoke
Smoke. Clear, with a low around 50. East wind around 3 mph.
7-day forecast for Roslyn
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 50°F | Smoke | 3 mph E | 0% |
| Tuesday | 74°F | Smoke | 2 to 7 mph E | 0% |
| Tuesday Night | 56°F | Areas Of Smoke | 5 mph NW | 0% |
| Wednesday | 79°F | Areas Of Smoke | 2 to 6 mph W | 0% |
| Wednesday Night | 60°F | Areas Of Smoke then Mostly Clear | 7 mph W | 0% |
| Thursday | 79°F | Sunny | 6 to 12 mph W | 0% |
| Thursday Night | 61°F | Mostly Clear | 13 mph W | 0% |
| Friday | 73°F | Sunny | 10 to 14 mph W | 0% |
| Friday Night | 57°F | Mostly Clear | 7 to 10 mph W | 0% |
| Saturday | 69°F | Sunny | 6 to 10 mph W | 0% |
| Saturday Night | 53°F | Mostly Clear | 10 mph W | 0% |
| Sunday | 64°F | Sunny | 10 mph W | 0% |
| Sunday Night | 51°F | Mostly Clear | 10 mph W | 0% |
| Monday | 64°F | Sunny | 10 mph W | 0% |
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 Aug 4, 2026.