Halbur, IA 51444 Frost Dates
When can you plant in Halbur, IA?
Around 04/27 is the usual last spring frost, about 242 days away. The first fall frost typically arrives around 10/11, about 166 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 Halbur, not a forecast for this year.
What to do before the first frost
About 6 weeks of growing season left in Halbur before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 04/27 isn't a guarantee
04/27 is the middle of 30 years of NOAA records, not a promise. Plant by 04/13 and you're betting against frost in roughly 9 years out of 10. 05/09 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Halbur compares
About 166 days separate Halbur's last and first frost, putting it 30,450 of 40,283 ZIP codes nationally. Within IA, it ranks 475 of 1,042.
Learn more
the frost range covers how to read the range around Halbur's dates instead of trusting one. local microclimates covers what one yard in Halbur can differ from the 51444 normal.