US First and Last Frost Dates

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USDA Hardiness Zone

This information is useful for at least two reasons,

  1. to calculate when to plant seeds or plant seedlings outside in the garden
  2. to figure out how late in the growing season you can plant certain perennials, trees, and shrubs

Dates on this chart are approximations, no one can KNOW the weather, every season is different. Most years, the first and last frost will fall within two weeks of the date on the chart, but some years, we get a very early frost or a late snow storm that throws the dates off. Please use discretion (and your local weather forecast!) along with this chart to plan your seed starting and planting.

First, click on the map if you need to enlarge it and find your zone if you don’t know it.
Then find your frost dates on the chart below.
US Zone Map

First and Last Frost Dates, by Hardiness Zone

USDA Hardiness Zone First Frost Date Last Frost Date
1* July 15th June 15th
2 August 15th May 15th
3 September 15th May 15th
4 September 15th May 15th
5 October 15th April 15th
6 October 15th April 15th
7 October 15th April 15th
8 November 15th March 15th
9 December 15th February 15th
10 December 15th January 31st**
11 No frost. No frost.

* Note: This zone is vulnerable to frost 365 days per year
** (sometimes earlier)

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