‘The Old Farmer’s Almanac’ has released predictions for when areas across the U.S. can expect to see the last frost of the season. According to The Old Farmer’s Almanac, frost can damage or kill certain emerging plants, such as tomatoes, sweet corn, and squash. Frost Date MapThe Old Farmer's AlmanacLike any long-range forecast, estimates can change. For more detailed information on your specific state, city, and zip code, visit the Old Farmer’s Almanac website. Yellow Regions : Rivaling green in coverage across the United States, yellow represents an average time for the last frost.