On this page:
Hillingdon Frost Dates & Growing Season
Here's the frost forecast for the next three days (last updated on December 8th, 2025 6:02 AM).
Dec 8th
Safe
Dec 9th
Safe
Dec 10th
Safe
Last Frost Date (Spring)
The average last frost date for Hillingdon is April 15th. We recommend waiting until April 29th before planting tender crops outdoors.
First Frost Date (Autumn)
The average first frost date for Hillingdon is November 25th.
Growing Season
Based on historical data, the growing season in Hillingdon is approximately 224 days long.
Hillingdon Planting Calendar
This weekly planting calendar displays the ideal windows for starting seeds, transplanting, and harvesting.
Hillingdon Monthly Gardening Guide
February
In February, you can start Broccoli indoors, start Petunia indoors, start Onion indoors, start Tomato indoors, and start Leek indoors.
March
In March, you can start Marigold indoors, start Moonflower indoors, sow Watercress outside, sow Sorrel outside, start Kale indoors, and sow Kale outside.
April
In April, you can sow Jute outside, sow Runner Bean outside, sow Morning Glory outside, sow Chia outside, and sow Alyssum outside.