UK Last Frost Date Planner

Free UK Last Frost Date Planner — Know When It's Safe to Plant Your Veg

Planting too early is one of the most common mistakes on the allotment. One late frost can wipe out a tray of tomato seedlings you've spent weeks nurturing, or set back your courgettes, beans and squash just when they're getting established. Our free UK Last Frost Date Planner takes the guesswork out entirely — just select your region and microclimate, and get a personalised planting calendar for all 36 vegetables we stock at Growseed.

Built specifically for UK conditions. No US hardiness zones. No generic advice. Just honest, practical planting dates based on historical Met Office frost data for your part of the country.

How the Last Frost Date Planner Works

Frost dates vary significantly across the UK — Cornwall's last frost typically falls in mid-March, while the Scottish Highlands can see frost right into June. Even within a region, your specific plot makes a difference. A sheltered walled garden can be two weeks ahead of an open field half a mile away, while a valley frost pocket can be several degrees colder than the surrounding land on a clear still night.

Our planner accounts for all of this:

• UK region — choose from 12 regions from Cornwall and the Scilly Isles through to the Scottish Highlands, each with historically accurate last and first frost dates
• Microclimate adjustment — sheltered or walled garden, open and exposed, frost pocket, or urban heat island — each shifts your dates accordingly
• Every crop covered — all 36 vegetable categories we sell, from frost-hardy broad beans and kale right through to frost-sensitive tomatoes, cucumbers and aubergines
• Sowing method included — whether to direct sow, transplant, or plant tubers and crowns, with a practical note for each crop
• Live status for today — each crop shows whether it's safe to plant right now, coming up soon, too early, or whether the window has passed for this season

What Your Results Include

• Your last frost date — the historical average for your region, adjusted for your microclimate
• Your first autumn frost — so you can plan the end of your season as well as the start
• Your growing season length — how many frost-free days you have to work with
• A full crop-by-crop calendar — safe planting dates for all 36 vegetable categories, with method and notes
• A downloadable planner — print your personalised calendar to take to the allotment with you

Understanding the Status Colours

Each crop in your calendar has a colour-coded status badge updated to today's date. Green means it's safe to get it in the ground now. Amber means the date is approaching — worth getting your plants or seeds ready. Red means it's still too early and a late frost could damage or kill the crop. Purple means the ideal window has passed for this season, though some crops can still be sown later with adjusted expectations.

Why Last Frost Dates Matter So Much

Most vegetables grown in the UK fall into one of two categories — those that can tolerate frost, and those that absolutely cannot. Getting this wrong in either direction costs you time, money and a growing season you can't get back.

Frost-hardy crops like broad beans, peas, brassicas and root vegetables can be sown well before your last frost date and will thrive in cooler conditions. Tender crops — tomatoes, courgettes, cucumbers, French beans, sweetcorn and most greenhouse vegetables — need to go out only once all risk of frost has passed. Plant them too early and even a single overnight frost can kill them outright.

Tips for Getting the Most From Your Planting Calendar

• Always check the forecast — our dates are historical averages, not a guarantee. A late cold snap can catch even experienced growers out. Check the 10-day forecast before transplanting anything tender
• Use fleece as insurance — a double layer of horticultural fleece can protect plants down to around -4°C, giving you a useful buffer if a late frost is forecast after you've planted out
• Know your frost pocket — cold air drains downhill and collects in hollows and valleys. If your plot sits low, your effective last frost date may be a week or two later than your regional average
• Harden off before transplanting — bring seedlings outside for progressively longer periods over 7–10 days before planting out, even after the frost risk has passed. This reduces transplant shock significantly
• Don't rush tomatoes — more tomato crops fail from being planted out too early than too late. Wait until night temperatures are consistently above 10°C, not just your last frost date