Gardening in Cornwall
Cornwall's Atlantic position gives many gardens a long, relatively mild growing year, especially near the south coast. Rain, wind and salt-laden air are often bigger gardening influences than hard frost. Inland valleys and higher ground can still be noticeably cooler, while exposed plots need shelter. Start spring sowing with the soil rather than the calendar: it can remain wet and slow to warm after a stormy winter.
The growing season in Cornwall
Based on the South West England region: last spring frost late April to mid May, first autumn frost late October to November.
One of Britain's longest growing seasons, shaped by mild maritime conditions. Coastal Cornwall, Devon and sheltered urban gardens may stay largely frost-free for long spells, while inland valleys and higher ground can be notably colder. These are approximate regional averages only: aspect, altitude and frost pockets can make a garden behave very differently.
What grows well in Cornwall
Tender ornamentals, early potatoes, salads, peas and brassicas can all suit sheltered Cornish plots, while mild coastal gardens may carry half-hardy plants for longer. Free-draining coastal soils benefit from generous compost and regular watering in dry spells; heavier inland ground needs careful drainage. Use hedging, fencing or permeable windbreaks to reduce exposure, and choose sturdy, salt-tolerant plants for gardens close to the sea.
Plan your Cornwall garden
Gardening in Cornwall: frequently asked questions
When is the last frost in Cornwall?
The last spring frost in Cornwall is typically around late April to mid May, and the first autumn frost around late October to November, based on the South West England region.
When can I start planting outdoors in Cornwall?
Hardy crops can be sown from early spring. Wait until after the last frost (around late April to mid May) before planting out tender crops such as tomatoes, courgettes and runner beans.
What grows well in Cornwall?
Tender ornamentals, early potatoes, salads, peas and brassicas can all suit sheltered Cornish plots, while mild coastal gardens may carry half-hardy plants for longer.
Frost and season figures are approximate regional averages; aspect, altitude and shelter shift them locally. Check the current Plymouth forecast before sowing tender crops. Page updated 18 Sep 2026.