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Marie, This data is based onMarie, This data is based on 30-year historical averages and a 50% probability. Many people in NH wait until Memorial Day to be safe from frosts. But every year is different and keep in mind your microclimate. You can click on the link below the chart to see other weather stations for your state and other probabilities.

2015 Special Edition Garden GuideCooking Fresh with The Old Farmer's AlmanacThe Almanac Monthly Digital MagazineWhat the heck is a Garden Hod?