Ogden, UT 84401 Frost Dates
84401, near Ogden, UT: the frost window
Typically, the last spring freeze lands around 04/21, roughly 236 days out. Fall's first freeze usually shows up around 10/23, roughly 184 days after the last spring frost.
Zone 7a (0 to 5°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 Ogden, not a forecast for this year.
Stretching the season past the first frost
Ogden's growing season runs out in roughly 8 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Ogden's last frost
04/21 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/02 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/06 and only about 1 year in 10 sees frost after that.
Ogden against the rest of the dataset
Ogden's growing season runs about 184 days, ranking 23,392 of 40,283 US ZIP codes measured here, longest to shortest. Within UT, it ranks 88 of 344.
Learn more
Two guides worth reading on 84401: zone vs. frost date, on why Zone 7a and Ogden's frost date answer different questions, and the frost range, on how to read the range around Ogden's dates instead of trusting one.