Sergeant Bluff, IA 51054 Frost Dates
Frost dates for Sergeant Bluff, IA, ZIP 51054
Around 04/29 is the usual last spring frost, about 244 days away. The first fall frost typically arrives around 10/05, about 159 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 Sergeant Bluff, not a forecast for this year.
What to do before the first frost
Zone 5a around Sergeant Bluff has about 5 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.
The actual range around Sergeant Bluff's last frost
04/29 is the middle of 30 years of NOAA records, not a promise. Plant by 04/16 and you're betting against frost in roughly 9 years out of 10. 05/14 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Sergeant Bluff compares
About 159 days separate Sergeant Bluff's last and first frost, putting it 32,641 of 40,283 ZIP codes nationally. Within IA, it ranks 778 of 1,042.
Learn more
zone vs. frost date explains why Zone 5a and Sergeant Bluff's frost date answer different questions, and the frost range explains how to read the range around Sergeant Bluff's dates instead of trusting one.