Oso, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Oso, a community in Snohomish County, Washington.
Today
81°F
Mostly Sunny
Mostly sunny. High near 81, with temperatures falling to around 77 in the afternoon. West southwest wind 0 to 5 mph.
7-day forecast for Oso
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 81°F | Mostly Sunny | 0 to 5 mph WSW | 0% |
| Tonight | 51°F | Mostly Clear | 0 to 5 mph NW | 0% |
| Sunday | 83°F | Mostly Sunny | 5 mph NW | 0% |
| Sunday Night | 51°F | Partly Cloudy | 0 to 5 mph NNE | 0% |
| Monday | 78°F | Mostly Sunny | 1 to 6 mph S | 0% |
| Monday Night | 49°F | Partly Cloudy | 0 to 5 mph NE | 0% |
| Tuesday | 73°F | Partly Sunny | 1 to 6 mph S | 0% |
| Tuesday Night | 47°F | Mostly Cloudy | 1 to 5 mph NE | 10% |
| Wednesday | 72°F | Partly Sunny then Slight Chance Light Rain | 1 to 5 mph SW | 16% |
| Wednesday Night | 48°F | Slight Chance Light Rain then Mostly Cloudy | 3 mph N | 16% |
| Thursday | 70°F | Mostly Cloudy then Slight Chance Light Rain | 1 to 5 mph ENE | 19% |
| Thursday Night | 47°F | Chance Light Rain | 1 to 5 mph N | 27% |
| Friday | 69°F | Chance Light Rain | 3 mph WNW | 27% |
| Friday Night | 45°F | Slight Chance Light Rain | 5 mph NNE | 16% |
Forecast source: National Weather Service (api.weather.gov) for Oso (48.284, -121.916). Updated through the day.
Growing snapshot for Oso
Last spring frost
Apr 22
First fall frost
Oct 19
Growing season
181 days
Hardiness zone
8b
More local growing data for Oso: nearby ZIP 98223 weather · frost dates · planting calendar · Washington frost dates
Nearby towns & communities
Alderwood Manor
Arlington
Arlington Heights
Bothell East
Bothell West
Brier
Bunk Foss
Canyon Creek
Cathcart
Cavalero
Chain Lake
Clearview
Darrington
Eastmont
Edmonds
Esperance
Everett
Fobes Hill
Gold Bar
Granite Falls
Hat Island
Kayak Point
Lake Bosworth
Lake Cassidy
Lake Cavanaugh
Lake Goodwin
Lake Roesiger
Lake Stevens
Lake Stickney
Larch Way
Climate data from the nearest NOAA station, Arlington, Wa (8.1 mi from Oso). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.