Snowflake, AZ 85937 Frost Dates
85937, near Snowflake, AZ: the frost window
Typically, the last spring freeze lands around 05/11, roughly 256 days out. Fall's first freeze usually shows up around 10/10, roughly 149 days after the last spring frost.
Snowflake sits in USDA Zone 7a (0 to 5°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
Stretching the season past the first frost
Snowflake's growing season runs out in roughly 6 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 05/11 isn't a guarantee
05/11 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/27 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/31 and only about 1 year in 10 sees frost after that.
Snowflake against the rest of the dataset
Snowflake's growing season runs about 149 days, ranking 35,513 of 40,283 US ZIP codes measured here, longest to shortest. Within AZ, it ranks 461 of 506.
Learn more
Two guides worth reading on 85937: local microclimates, on what one yard in Snowflake can differ from the 85937 normal, and zone vs. frost date, on why Zone 7a and Snowflake's frost date answer different questions.