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Lisburn and Castlereagh Frost Dates & Growing Season
Here's the frost forecast for the next three days (last updated on December 8th, 2025 6:07 AM).
Dec 8th
Safe
Dec 9th
Safe
Dec 10th
Safe
Last Frost Date (Spring)
The average last frost date for Lisburn and Castlereagh is May 1st. We recommend waiting until May 15th before planting tender crops outdoors.
First Frost Date (Autumn)
The average first frost date for Lisburn and Castlereagh is November 10th.
Growing Season
Based on historical data, the growing season in Lisburn and Castlereagh is approximately 193 days long.
Lisburn and Castlereagh Planting Calendar
This weekly planting calendar displays the ideal windows for starting seeds, transplanting, and harvesting.
Lisburn and Castlereagh Monthly Gardening Guide
February
In February, you can start Onion indoors, start Impatiens indoors, start Petunia indoors, start Snapdragon indoors, and start Leek indoors.
March
In March, you can start Cabbage indoors, start Coleus indoors, start Rue indoors, start Brussel Sprout indoors, and start Thyme indoors.
April
In April, you can start Pumpkin indoors, sow Cilantro outside, sow Dill outside, sow Flax outside, and sow Sorrel outside.
May
In May, you can sow Moss Rose outside, sow Cosmos outside, sow Butternut Squash outside, sow Anise outside, and sow Pumpkin outside.