First and Last Frost Dates

First and Last Frost Dates
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First and Last Frost Dates

First and Last Frost Dates: A Comprehensive Guide by USDA Hardiness Zones

As the seasons transition and temperatures fluctuate, gardeners across the United States eagerly await the arrival of spring and dread the chill of autumn. One crucial factor in successful gardening is understanding the first and last frost dates specific to your USDA Hardiness Zone. You can find your Zone by entering your zip code: on desktop at the link above in the black bar ""My Growing Zone""; on mobile by linking to any project page and selecting ""Find My Planting Zone"" link at the top of the page.

Understanding Frost Dates

Frost dates mark the beginning and end of the frost-free growing season, serving as a valuable reference point for garden planning. The last frost date in spring is the date after which the risk of frost is significantly reduced, making      it safer to transplant tender plants outdoors. The first frost date in fall, on the other hand, signifies the return of colder temperatures and the potential for frost damage to sensitive vegetation.    

USDA Hardiness Zones

Zone Average First Frost Date Average Last Frost Date
3, 4 September 1st to 30th May 1st to 31st
5, 6, 7 September 30th to October 30th March 30th to April 30th
8 October 30th to November 30th February 22nd to March 30th
9 November 30th to December 30th January 30th to February 28th
10 November 30th to December 30th January 30th or earlier

Source: The Spruce

The USDA Hardiness Zone Map divides the United States into zones based on average minimum winter temperatures. Knowing your specific zone helps you determine the best plants to grow in your region and when to start planting. Park Seed's app, From Seed to Spoon, will calculate these dates for you and provide you with the ideal timing for garden tasks conveniently on your phone. And that's just one of the tools the app provides.  It will also help you identify pests and beneficials, learn about the nutrients your garden provides and how they help your overall wellness or support specific health issues.  

 

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