Oregon frost dates

Average last spring and first fall frost dates for Oregon’s largest cities, with each city’s USDA hardiness zone.

Reviewed October 2026

Among Oregon’s 20 largest cities, the average last spring frost ranges from Feb 25 in Portland to Jun 9 in Redmond. Elevation, distance from the coast and city heat all shift the date, so use your own ZIP code below for the closest match.

City	Average last spring frost	Average first fall frost	Frost-free days	Hardiness zone	Weather station used
Portland	Feb 25	Dec 1	279	8b–9a	Portland Kgw-Tv, OR, 2 mi
Salem	Apr 3	Nov 1	212	8b	Salem Mcnary Fld, OR, 2 mi
Eugene	Apr 11	Oct 23	195	8b	Eugene Mahlon Sweet Airport, OR, 7 mi
Gresham	Mar 16	Nov 20	249	8b–9a	Portland Troutdale Airport, OR, 4 mi
Hillsboro	Apr 16	Oct 23	190	8b–9a	Portland-Hillsboro Airport, OR
Bend	Jun 6	Sep 20	106	6b	Bend, OR
Beaverton	Apr 1	Nov 6	219	8b–9a	Beaverton 2 Ssw, OR, 2 mi
Medford	Apr 8	Oct 29	204	8b	Medford Rogue Vly Airport, OR, 3 mi
Corvallis	Apr 17	Oct 28	194	8b	Corvallis State Univ, OR, 6 mi
Springfield	Apr 11	Oct 23	195	8b	Eugene Mahlon Sweet Airport, OR, 13 mi
Tigard	Apr 1	Nov 6	219	8b–9a	Beaverton 2 Ssw, OR, 3 mi
Albany	Apr 17	Oct 28	194	8b	Corvallis State Univ, OR, 5 mi
Lake Oswego	Mar 18	Nov 18	245	8b–9a	Oregon City, OR, 6 mi
Grants Pass	Apr 8	Oct 28	203	8b	Grants Pass, OR
Keizer	Apr 3	Nov 1	212	8b	Salem Mcnary Fld, OR, 7 mi
Oregon City	Mar 18	Nov 18	245	9a	Oregon City, OR
Redmond	Jun 9	Sep 14	97	6b	Redmond Roberts Fld, OR, 2 mi
McMinnville	Apr 5	Nov 7	216	8b	Mc Minnville, OR, 2 mi
Woodburn	Mar 16	Nov 14	243	8b	Aurora State Airport, OR, 8 mi
Happy Valley	Mar 18	Nov 18	245	8b–9a	Oregon City, OR, 7 mi

Frost dates are the dates after (spring) or before (fall) which the chance of a 32°F freeze is below 50%, from NOAA’s 1991–2020 U.S. Climate Normals for the weather station nearest each city’s center. Zones are from the 2023 USDA Plant Hardiness Zone Map for the ZIP codes around each city; a range means nearby ZIP codes differ. Cities are the 20 largest by Census Bureau 2024 population estimates.

An average is not a guarantee. There’s still about a 1 in 2 chance of frost after the average last spring date. Many gardeners wait an extra week or two before setting out tomatoes, peppers and basil, and keep covers handy.

Planting dates for Portland

Timed from Portland’s average last frost of Feb 25, using University of New Hampshire Extension’s planting guidance. For your exact dates, enter your ZIP code in the calendar below.

Crop	Start seeds indoors	Plant outside
Tomatoes	Jan 7 to Jan 21	Mar 4 to Mar 11
Peppers	Dec 31 to Jan 14	Mar 11
Lettuce	Dec 24 to Dec 31	Jan 28 to Feb 4
Broccoli	Dec 17 to Dec 31	Jan 28 to Feb 11
Cucumbers	Feb 4 to Feb 11	Mar 4 to Mar 11
Basil	Jan 14 to Jan 28	Mar 11

When to plant, for your garden

Your seed-starting and planting dates, timed from your last spring frost. Full calendar, 12 crops.

ZIP code

Last frost date

Enter your ZIP code to look up your average last frost date and hardiness zone, or type the date in yourself.

Frost dates: NOAA U.S. Climate Normals, 1991–2020. Hardiness zones: USDA Plant Hardiness Zone Map, 2023, ZIP code data from PRISM Group, Oregon State University, prism.oregonstate.edu, accessed Oct. 20, 2026.

More about frost dates

How to find your last frost date, and what your zone means · Full planting calendar · How to start seeds indoors

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