Rolla, MO 65402 Frost Dates
Rolla, MO: when does the frost end?
Typically, the last spring freeze lands around 04/05, roughly 220 days out. Fall's first freeze usually shows up around 11/01, roughly 207 days after the last spring frost.
Zone 6b (-5 to 0°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 Rolla, not a forecast for this year.
Stretching the season past the first frost
With roughly 9 weeks until Rolla's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Rolla's last frost
04/05 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/21 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/22 and only about 1 year in 10 sees frost after that.
Rolla against the rest of the dataset
About 207 days separate Rolla's last and first frost, putting it 15,796 of 40,283 ZIP codes nationally. Within MO, it ranks 198 of 1,129.
Learn more
Before leaning on 65402's figures: zone vs. frost date explains why Zone 6b and Rolla's frost date answer different questions, while the frost range explains how to read the range around Rolla's dates instead of trusting one.