Marietta-Alderwood, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Marietta-Alderwood, a community in Whatcom County, Washington.
Overnight
54°F
Mostly Clear
Mostly clear, with a low around 54. Wind around 0 mph.
7-day forecast for Marietta-Alderwood
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 54°F | Mostly Clear | 0 mph | 0% |
| Tuesday | 80°F | Sunny | 0 to 7 mph NW | 0% |
| Tuesday Night | 57°F | Mostly Clear | 0 to 5 mph SW | 0% |
| Wednesday | 83°F | Sunny | 0 to 6 mph NW | 0% |
| Wednesday Night | 58°F | Mostly Clear | 0 to 5 mph SW | 0% |
| Thursday | 82°F | Sunny | 1 to 5 mph SSW | 0% |
| Thursday Night | 59°F | Mostly Clear | 3 mph S | 0% |
| Friday | 78°F | Sunny | 2 to 7 mph S | 0% |
| Friday Night | 58°F | Mostly Clear | 1 to 6 mph S | 0% |
| Saturday | 75°F | Sunny | 1 to 7 mph S | 0% |
| Saturday Night | 56°F | Mostly Clear | 2 to 7 mph S | 0% |
| Sunday | 72°F | Mostly Sunny | 3 to 7 mph SSW | 0% |
| Sunday Night | 56°F | Mostly Clear | 1 to 6 mph SSW | 2% |
| Monday | 72°F | Mostly Sunny | 1 to 7 mph SW | 2% |
Forecast source: National Weather Service (api.weather.gov) for Marietta-Alderwood (48.788, -122.555). Updated through the day.
Growing snapshot for Marietta-Alderwood
Last spring frost
Apr 1
First fall frost
Nov 2
Growing season
216 days
Hardiness zone
8b
More local growing data for Marietta-Alderwood: nearby ZIP 98225 weather · frost dates · planting calendar · Washington frost dates
Nearby towns & communities
Acme
Bellingham
Birch Bay
Blaine
Custer
Deming
Everson
Ferndale
Geneva
Glacier
Kendall
Lynden
Maple Falls
Nooksack
Peaceful Valley
Point Roberts
Sudden Valley
Sumas
Climate data from the nearest NOAA station, Bellingham 3 Ssw, Wa (2.8 mi from Marietta-Alderwood). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.