Prescott, OR 98609 Frost Dates
98609, near Prescott, OR: the frost window
Typically, the last spring freeze lands around 04/08, roughly 223 days out. Fall's first freeze usually shows up around 11/05, roughly 210 days after the last spring frost.
Zone 8b (15 to 20°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 Prescott, not a forecast for this year.
Stretching the season past the first frost
Prescott's growing season runs out in roughly 10 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
04/08 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/11 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/02 and only about 1 year in 10 sees frost after that.
Prescott against the rest of the dataset
Prescott's growing season runs about 210 days, ranking 15,134 of 40,283 US ZIP codes measured here, longest to shortest. Within OR, it ranks 209 of 463.
Learn more
Two guides worth reading on 98609: the frost range, on how to read the range around Prescott's dates instead of trusting one, and local microclimates, on what one yard in Prescott can differ from the 98609 normal.