Port Orford, OR 97464 Frost Dates
Port Orford, OR: when does the frost end?
Typically, the last spring freeze lands around 03/16, roughly 200 days out. Fall's first freeze usually shows up around 11/29, roughly 258 days after the last spring frost.
Zone 9b (25 to 30°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Port Orford, not a forecast for this year.
Stretching the season past the first frost
With roughly 13 weeks until Port Orford's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 03/16 isn't a guarantee
03/16 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/06 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/15 and only about 1 year in 10 sees frost after that.
Port Orford against the rest of the dataset
Port Orford's growing season runs about 258 days, ranking 6,654 of 40,283 US ZIP codes measured here, longest to shortest. Within OR, it ranks 43 of 463.
Learn more
Before leaning on 97464's figures: zone vs. frost date explains why Zone 9b and Port Orford's frost date answer different questions, while the frost range explains how to read the range around Port Orford's dates instead of trusting one.