Waterloo, OR Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Waterloo, a town in Linn County, Oregon.
This Afternoon
72°F
Sunny
Sunny, with a high near 72. West northwest wind around 5 mph.
7-day forecast for Waterloo
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 72°F | Sunny | 5 mph WNW | 0% |
| Tonight | 50°F | Mostly Clear then Patchy Fog | 2 mph NW | 0% |
| Saturday | 78°F | Patchy Fog then Mostly Sunny | 1 to 5 mph N | 0% |
| Saturday Night | 51°F | Partly Cloudy then Patchy Fog | 0 to 5 mph NW | 0% |
| Sunday | 80°F | Patchy Fog then Sunny | 0 to 6 mph NNW | 0% |
| Sunday Night | 52°F | Mostly Clear then Areas Of Fog | 0 to 6 mph NNW | 0% |
| Monday | 76°F | Areas Of Fog then Mostly Sunny | 0 to 7 mph NNW | 0% |
| Monday Night | 50°F | Partly Cloudy then Patchy Fog | 0 to 7 mph N | 0% |
| Tuesday | 73°F | Areas Of Fog then Mostly Sunny | 0 to 7 mph NNW | 1% |
| Tuesday Night | 47°F | Partly Cloudy | 0 to 7 mph N | 1% |
| Wednesday | 73°F | Mostly Sunny | 0 to 6 mph NNW | 0% |
| Wednesday Night | 49°F | Partly Cloudy | 1 to 6 mph NE | 0% |
| Thursday | 76°F | Mostly Sunny | 0 to 5 mph SE | 6% |
| Thursday Night | 51°F | Slight Chance Light Rain | 5 mph SSW | 23% |
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
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Climate data from the nearest NOAA station, Lebanon, Or (4 mi from Waterloo). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.