Frost Dates in Wales
mid to late May
October
The growing season here
Wales has striking local contrasts: maritime coasts can be mild and prolonged, while upland areas, including Snowdonia, are cooler and more exposed. Rainfall and wind also shape growing conditions. These frost periods are approximate regional averages, not fixed dates; altitude, valley frost pockets, shelter and distance from the sea can change timings substantially.
What it means for sowing & planting out
Sow hardy vegetables and flowers outdoors when the ground is suitable, but begin tender crops under cover. Plant out tomatoes, courgettes, beans, squash and tender bedding only after frost danger has passed for your exact site, which may be later in upland or valley gardens. Harden plants off, use fleece for unexpected cold, and check the Met Office forecast before planting outside.
Tips
Create shelter from wind with hedging, fences or carefully placed planting, without shading crops. Raised beds can improve drainage and warm earlier in wetter districts. Coastal gardeners may sow sooner, but hillside and valley plots should follow their own microclimate rather than a regional average.
These are approximate regional averages - frost varies with altitude, frost pockets, coast and aspect. Check the Met Office forecast for your area before acting. Page updated 18 Sep 2026.