Simla, CO 80832 Frost Dates
Simla, CO: when does the frost end?
The last spring frost here typically falls around 05/09, about 254 days from today. Fall's first freeze usually shows up around 10/04, roughly 146 days after the last spring frost.
Simla sits in USDA Zone 5b (-15 to -10°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
Stretching the season past the first frost
With roughly 5 weeks until Simla's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Simla's last frost
05/09 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/29 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/22 and only about 1 year in 10 sees frost after that.
Simla against the rest of the dataset
About 146 days separate Simla's last and first frost, putting it 36,087 of 40,283 ZIP codes nationally. Within CO, it ranks 364 of 624.
Learn more
Before leaning on 80832's figures: zone vs. frost date explains why Zone 5b and Simla's frost date answer different questions, while the frost range explains how to read the range around Simla's dates instead of trusting one.