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Northumberland Frost Dates & Growing Season
Here's the frost forecast for the next three days (last updated on December 8th, 2025 6:03 AM).
Dec 8th
Safe
Dec 9th
Safe
Dec 10th
Safe
Last Frost Date (Spring)
The average last frost date for Northumberland is May 15th. We recommend waiting until May 29th before planting tender crops outdoors.
First Frost Date (Autumn)
The average first frost date for Northumberland is October 20th.
Growing Season
Based on historical data, the growing season in Northumberland is approximately 158 days long.
Northumberland Planting Calendar
This weekly planting calendar displays the ideal windows for starting seeds, transplanting, and harvesting.
Northumberland Monthly Gardening Guide
March
In March, you can start Rue indoors, start Pansy indoors, start Coneflower indoors, start Stevia indoors, and start Begonia indoors.
April
In April, you can sow Parsley outside, start Sage indoors, sow Sweet Pea outside, sow Poppy outside, and sow California Poppy outside.
May
In May, you can sow Pumpkin outside, sow Morning Glory outside, sow Runner Bean outside, sow Okra outside, and sow Swiss Chard outside.