Waterloo, OR Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Waterloo, a town in Linn County, Oregon.
This Afternoon
58°F
Mostly Sunny
Mostly sunny. High near 58, with temperatures falling to around 53 in the afternoon. Wind around 0 mph.
7-day forecast for Waterloo
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 58°F | Mostly Sunny | 0 mph | 3% |
| Tonight | 37°F | Patchy Fog | 3 mph SE | 3% |
| Wednesday | 60°F | Patchy Fog then Chance Light Rain | 3 mph S | 33% |
| Wednesday Night | 45°F | Light Rain then Mostly Cloudy | 3 to 8 mph S | 89% |
| Thursday | 59°F | Mostly Sunny | 0 to 3 mph SSW | 11% |
| Thursday Night | 42°F | Mostly Cloudy then Slight Chance Light Rain | 0 to 5 mph ESE | 22% |
| Friday | 60°F | Chance Light Rain | 1 to 5 mph SSE | 26% |
| Friday Night | 42°F | Mostly Cloudy | 3 mph SSE | 13% |
| Saturday | 65°F | Patchy Fog then Slight Chance Light Rain | 2 mph S | 15% |
| Saturday Night | 47°F | Light Rain Likely | 2 to 13 mph S | 69% |
| Sunday | 59°F | Light Rain Likely | 1 to 9 mph SSW | 69% |
| Sunday Night | 43°F | Patchy Fog | 2 mph SE | 14% |
| Monday | 59°F | Chance Light Rain | 3 mph S | 34% |
| Monday Night | 44°F | Chance Light Rain | 2 to 9 mph S | 37% |
Forecast source: National Weather Service (api.weather.gov) for Waterloo (44.495, -122.824). Updated through the day.
Growing snapshot for Waterloo
Last spring frost
Mar 14
First fall frost
Nov 18
Growing season
248 days
Hardiness zone
8b
More local growing data for Waterloo: nearby ZIP 97355 weather · frost dates · planting calendar · Oregon frost dates
Nearby towns & communities
Albany
Black Butte Ranch
Brownsville
Cascadia
Crabtree
Crawfordsville
Detroit
Halsey
Harrisburg
Holley
Idanha
Lacomb
Lebanon
Mill City
Millersburg
Scio
Shedd
Sodaville
South Lebanon
Sweet Home
Tangent
West Scio
Climate data from the nearest NOAA station, Lebanon, Or (4 mi from Waterloo). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.