Spring and Fall Frost Dates for US Zip Code 20170

Enter your zip code:
Last Frost Date
April 9
30-Year Range
March 23-April 22
First Frost Date
October 29
30-Year Range
October 2-November 20
Typical Growing season
203 days
What's the chance of more frost this Spring?
Probably more frost
Probability of last frost date
March 26April 4April 9April 17April 205%25%50%75%95%<1 year3 years5 years8 years>9 years
Chance in a 10 year period
About this frost date data

This date was collected using hourly weather observations from the weather station located at washington dulles international airport, va us. The data spans 30 years from 1990 to 2020.

The data was collected using the Visual Crossing Weather API and then processed to extract the last frost date of the Spring and the first frost date of the fall for each year.

The typical frost date is the average of the 30 years of frost dates. The typical growing season is the number of days between the average last frost date in the Spring and the first frost date in the Fall.

With our changing climate, please use these dates as guide to your planting. If you need to check the weather forecast, see the 15-day weather forecast.