Grand Junction, IA 50107 Frost Dates
Frost dates for Grand Junction, IA, ZIP 50107
Around 04/26 is the usual last spring frost, about 241 days away. The first fall frost typically arrives around 10/09, about 164 frost-free days later.
Zone 5a (-20 to -15°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 Grand Junction, not a forecast for this year.
What to do before the first frost
Zone 5a around Grand Junction has about 6 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
Why 04/26 isn't a guarantee
04/26 is the middle of 30 years of NOAA records, not a promise. Plant by 04/12 and you're betting against frost in roughly 9 years out of 10. 05/08 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Grand Junction compares
At roughly 164 frost-free days, Grand Junction places 31,088 of 40,283 ZIP codes in this dataset. Within IA, it ranks 607 of 1,042.
Learn more
zone vs. frost date explains why Zone 5a and Grand Junction's frost date answer different questions, and the frost range explains how to read the range around Grand Junction's dates instead of trusting one.