Lodge Grass, MT 59050 Frost Dates
Frost dates for Lodge Grass, MT, ZIP 59050
The last spring frost here typically falls around 05/21, about 266 days from today. The first fall frost typically arrives around 09/17, about 117 frost-free days later.
The USDA Plant Hardiness Zone Map puts Lodge Grass in Zone 5a (-20 to -15°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 5a around Lodge Grass has about 3 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 Lodge Grass's last frost
05/21 is the middle of 30 years of NOAA records, not a promise. Plant by 05/09 and you're betting against frost in roughly 9 years out of 10. 06/02 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Lodge Grass compares
About 117 days separate Lodge Grass's last and first frost, putting it 39,255 of 40,283 ZIP codes nationally. Within MT, it ranks 236 of 392.
Learn more
zone vs. frost date explains why Zone 5a and Lodge Grass's frost date answer different questions, and the frost range explains how to read the range around Lodge Grass's dates instead of trusting one.