Clyde Park, MT 59086 Frost Dates
Clyde Park, MT: when does the frost end?
Around 06/08 is the usual last spring frost, about 284 days away. Fall's first freeze usually shows up around 09/07, roughly 89 days after the last spring frost.
Zone 4b (-25 to -20°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 Clyde Park, not a forecast for this year.
Stretching the season past the first frost
With roughly 1 week until Clyde Park's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
06/08 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/23 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/30 and only about 1 year in 10 sees frost after that.
Clyde Park against the rest of the dataset
Clyde Park's growing season runs about 89 days, ranking 39,933 of 40,283 US ZIP codes measured here, longest to shortest. Within MT, it ranks 339 of 392.
Learn more
Before leaning on 59086's figures: zone vs. frost date explains why Zone 4b and Clyde Park's frost date answer different questions, while the frost range explains how to read the range around Clyde Park's dates instead of trusting one.