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Slough Frost Dates & Growing Season
Here's the frost forecast for the next three days (last updated on December 8th, 2025 6:05 AM).
Dec 8th
Safe
Dec 9th
Safe
Dec 10th
Safe
Last Frost Date (Spring)
The average last frost date for Slough is April 20th. We recommend waiting until May 4th before planting tender crops outdoors.
First Frost Date (Autumn)
The average first frost date for Slough is November 20th.
Growing Season
Based on historical data, the growing season in Slough is approximately 214 days long.
Slough Planting Calendar
This weekly planting calendar displays the ideal windows for starting seeds, transplanting, and harvesting.
Slough Monthly Gardening Guide
February
In February, you can start Leek indoors, start Coleus indoors, start Begonia indoors, start Pansy indoors, and start Artichoke indoors.
March
In March, you can sow Arugula outside, sow Lupine outside, sow Milkweed outside, sow Pea outside, and start Cantaloupe indoors.
April
In April, you can sow Butternut Squash outside, sow Lentil outside, sow Nasturtium outside, sow Sunflower outside, and sow Cosmos outside.
May
In May, you can sow Jute outside, sow Butterfly Pea outside, sow Watermelon outside, sow Melon outside, and sow Corn outside.