Waterloo, OR Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Waterloo, a town in Linn County, Oregon.

Today

78°F

Areas Of Fog then Mostly Sunny

Areas of fog before 9am. Mostly sunny, with a high near 78. North northwest wind 0 to 5 mph.

7-day forecast for Waterloo

When	Temp	Forecast	Wind	Precip
Today	78°F	Areas Of Fog then Mostly Sunny	0 to 5 mph NNW	0%
Tonight	50°F	Partly Cloudy then Patchy Fog	0 to 3 mph NNW	0%
Sunday	79°F	Patchy Fog then Sunny	0 to 6 mph NNW	0%
Sunday Night	52°F	Mostly Clear then Patchy Fog	0 to 5 mph N	0%
Monday	76°F	Areas Of Fog then Mostly Sunny	0 to 7 mph NNW	0%
Monday Night	49°F	Mostly Clear then Areas Of Fog	0 to 7 mph N	0%
Tuesday	73°F	Areas Of Fog then Mostly Sunny	0 to 6 mph NNW	0%
Tuesday Night	47°F	Partly Cloudy then Patchy Fog	0 to 6 mph N	0%
Wednesday	72°F	Patchy Fog then Mostly Sunny	0 to 5 mph NNW	0%
Wednesday Night	48°F	Partly Cloudy	1 to 5 mph N	1%
Thursday	71°F	Mostly Sunny	1 to 7 mph NNE	6%
Thursday Night	48°F	Mostly Cloudy	2 to 7 mph NNW	10%
Friday	68°F	Mostly Sunny	2 to 8 mph NNW	9%
Friday Night	46°F	Partly Cloudy	2 to 8 mph NNE	9%

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

More local growing data for Waterloo: nearby ZIP 97355 weather · frost dates · planting calendar · Oregon frost dates

Nearby towns & communities

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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.