Rathdrum, ID 83858 Frost Dates
Frost dates for Rathdrum, ID, ZIP 83858
Around 04/22 is the usual last spring frost, about 237 days away. The first fall frost typically arrives around 10/18, about 179 frost-free days later.
The USDA Plant Hardiness Zone Map puts Rathdrum in Zone 6b (-5 to 0°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 6b around Rathdrum has about 7 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 Rathdrum's last frost
04/22 is the middle of 30 years of NOAA records, not a promise. Plant by 04/04 and you're betting against frost in roughly 9 years out of 10. 05/06 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Rathdrum compares
Rathdrum's growing season runs about 179 days, ranking 25,238 of 40,283 US ZIP codes measured here, longest to shortest. Within ID, it ranks 40 of 320.
Learn more
zone vs. frost date explains why Zone 6b and Rathdrum's frost date answer different questions, and the frost range explains how to read the range around Rathdrum's dates instead of trusting one.