UK frost dates vary more than you might expect. A sowing date that works in Cornwall or a sheltered garden may be too early for northern England, inland Wales, an exposed allotment or a frost pocket.
Most gardeners checking the first or last frost date in the UK really want to know when it is safe to sow, plant out or protect tender crops.
Frost dates are best treated as guideposts, not guarantees. This guide covers typical UK frost windows, what can shift them locally, and how to use them in your own garden.
What Are Frost Dates?
Frost dates are rough guide points for when frost becomes less likely in spring and more likely again in autumn. They help you judge when to sow, plant out, harvest and protect cold-sensitive crops.
They are based on typical conditions, so experienced growers treat frost dates as risk windows rather than fixed deadlines.
At a glance
| Frost date | What it means | Why it matters |
|---|---|---|
| Last frost date | The average point in spring after which frost becomes less likely | Helps judge when tender crops may be safer to plant out |
| First frost date | The average point in autumn when frost becomes more likely | Helps with harvesting, late sowings and preparing beds for winter |
Last Frost Date
The last frost date is the average point in spring after which frost becomes less likely. It matters most when planting tender crops outside.
“Less likely” does not mean impossible. Late frosts can still occur, particularly in frost pockets, exposed gardens, northern areas and upland plots.
Cold nights can also check growth even without visible frost damage, so the real question is not just whether a plant will survive, but whether conditions are warm enough for it to establish properly.
First Frost Date
The first frost date is the average point in autumn when frost starts becoming more likely. It helps you judge how much growing time tender crops have left.
It can affect tomato ripening, how long courgettes and French and runner beans keep cropping, whether late sowings are worthwhile, and when beds need preparing for winter.
Cold nights often slow tender crops before the first proper frost arrives, so the practical end of the growing season can come slightly earlier than the date itself suggests.
Approximate UK Frost Date Guide
No single UK frost date table will be perfect, but broad estimates give you a useful starting point. They help you judge whether your garden is likely to run earlier, later or roughly in line with general UK planting advice.
These are planning estimates, not hard deadlines.
A simple guide to typical UK frost windows
| UK area type | Approximate last frost | Approximate first frost | Growing season notes |
|---|---|---|---|
| Mild coastal / South West | March to April | October to November | Longer growing season, but still watch local conditions and cold nights |
| Average lowland UK | April to May | October | Good baseline for most UK planting guides |
| Cool northern / upland | May to early June | September to October | Shorter season, with more need for protection and indoor starts |
| Frost pockets / exposed gardens | Later than nearby areas | Earlier than nearby areas | Local conditions may matter more than region |
How to use this table properly
Treat it as a rough framework rather than the final answer.
Two growers in the same county may still work to different practical dates if:
- One has a sheltered back garden
- The other has a windy, open allotment
- One plot warms quickly in spring
- The other sits on heavy, slow-warming soil
The table gets you close. Your actual planting window can still shift depending on how your own plot behaves.
Adjusting UK Frost Dates for Your Garden
Regional frost dates are a useful starting point, but your own garden can run earlier or later than the wider area around it.
The biggest differences usually come from exposure, position, soil and the amount of warmth your plot holds overnight.
The main factors that shift frost timing
| Factor | How it can affect your garden |
|---|---|
| Region | Southern and coastal areas often warm earlier, while northern and upland areas usually stay colder for longer |
| Exposure | Sheltered gardens can warm sooner than open, windy allotments |
| Slope and position | Low ground can collect cold air and become a frost pocket |
| Soil type | Heavy, wet soil usually warms more slowly than lighter, free-draining soil |
| Urban warmth | Walls, paving and buildings can soften overnight lows |
Region still matters
Southern and coastal areas generally warm earlier, while northern, inland and upland gardens tend to stay colder for longer.
That affects frost risk, soil temperature and how confidently you can move tender plants outside, but regional advice is still only a starting point.
Exposure can make a big difference
A sheltered back garden can behave very differently from an open allotment nearby.
Walls, hedges and buildings can reduce wind and help retain warmth, while exposed plots often stay colder and can take longer to get young plants established.
Watch for frost pockets
Cold air settles in low areas, so the bottom of a slope, valley garden or sheltered dip can stay frostier than higher ground nearby.
A plot may effectively run later if it is:
- Low-lying
- Prone to frost
- Shaded early in the day
- Slow to dry after rain
This is one reason neighbouring gardens can have noticeably different practical frost dates.
Soil can delay the season too
Heavy, wet soil generally warms more slowly than lighter, free-draining ground.
That matters particularly for tender crops such as French and runner beans, sweetcorn, courgettes, squash and cucumbers, which can struggle if planted into cold soil even after the main frost risk has eased.
Urban gardens can run warmer
Walls, paving and nearby buildings store heat and can soften overnight temperatures, allowing some urban gardens to move slightly earlier.
That local warmth can help, but it does not remove the risk from a wider cold snap.
The wider region gives you the starting point. Your own garden decides the practical date.
What Frost Dates Mean for Vegetable Growing
Frost dates help shape some of the biggest decisions in the growing season: when to sow, plant out, protect crops and whether late sowings still have time to mature.
For hardy crops, they are something to work around. For tender crops, they can make the difference between a strong start and a stalled plant.
Why they matter in practice
| Decision | How frost dates help |
|---|---|
| Sowing | Helps you avoid starting too early |
| Planting out | Helps judge when tender crops are less likely to be hit by frost or cold nights |
| Crop protection | Helps you know when fleece, cloches or covers may still be needed |
| Harvest timing | Helps judge how much autumn growing time remains |
| Succession sowing | Helps decide whether later sowings still have time to mature |
Tender crops vs hardy crops
| Crop group | Typical examples | Practical approach |
|---|---|---|
| Tender crops | Tomatoes, courgettes, cucumbers, squash, pumpkins, sweetcorn, French and runner beans, basil, chillies, peppers | Wait for lower frost risk, milder nights and warmer soil |
| Hardy and semi-hardy crops | Broad beans, peas, onions, garlic, leeks, kale, cabbage, spinach, chard, lettuce, radish, potatoes | Can usually start earlier, but still need sensible timing |
Tender crops are most likely to stall or suffer if they go out too early. Hardy crops are more forgiving, but they still establish better when the soil is workable and not cold or waterlogged.
Using a planting calendar?
Start with the normal UK sowing and planting window, then use your local frost window, soil temperature and short-term forecast to adjust it for your garden.
Why the Last Frost Date Is Not the Whole Story
The last frost date is useful, but it does not tell you whether the soil is warm enough, nights are mild enough or the weather is settled.
A useful way to think about it is:
Frost dates tell you when damaging cold becomes less likely. Soil temperature and night temperatures tell you whether plants are likely to establish and grow.
Before planting tender crops outside, ask:
- Are nights reliably milder?
- Has the soil warmed?
- Does the short-term forecast look settled?
- Have the plants been hardened off?
So rather than asking:
“Has the last frost date passed?”
ask:
“Are these plants likely to establish and grow well outside now?”
Where Are You in the Growing Season?
Your frost dates matter differently depending on the time of year. Use them as a guide, then follow the route that matches what your garden is doing now.
Autumn — the first frost is approaching
As nights cool, start thinking about:
- Harvesting tender crops before they are damaged
- Protecting anything you want to keep going
- Deciding which crops can stay outside
- Whether late sowings still have enough time to mature
If you are still planting for the colder months, see our guide to what you can grow in autumn and winter in the UK.
Winter — frost is part of the season
Once regular cold weather arrives, frost dates matter less than the crops you have in the ground.
Focus on:
- Hardy and overwintering crops
- Protecting anything vulnerable
- Avoiding cold, waterlogged soil
- Getting ready for spring sowing
Our winter growing guide covers what to sow, harvest and protect through the colder months.
Spring — waiting for the last frost
The last frost date is useful, but do not rely on it alone before planting tender crops outside.
Also check:
- Overnight temperatures
- Soil warmth
- The short-term forecast
- Whether your plants have been hardened off
Once conditions line up, you can start moving into your normal spring vegetable planting schedule.
Frost Forecast Tonight?
If frost is forecast and you still have tender crops outside, cover them with fleece or a cloche, or move pots under cover where possible.
Established hardy crops usually need much less attention, but tender crops such as courgettes, French and runner beans, tomatoes and basil can be damaged quickly by a cold night.
For a fuller breakdown of what actually needs protecting and the best methods to use, see our guide to protecting vegetables from frost in the UK.
UK Frost Dates FAQs
There is no single UK last frost date. Mild coastal areas may see their last frost in March or April, while northern, upland and exposed areas may still experience frost into May or early June.
Use the regional dates as a starting point, then adjust for your own garden and the short-term forecast.
The first autumn frost often arrives between September and November, depending on location and exposure.
Cool northern and upland areas usually see frost earlier, while mild coastal and sheltered gardens may remain frost-free for longer.
Tomatoes are tender, so wait until the main frost risk has passed and overnight temperatures are reliably milder.
Your local frost date is useful, but also check the forecast and make sure plants have been hardened off before planting outside.
Courgettes should normally go outside once frost risk is low, the soil has warmed and nights are reasonably mild.
Planting too early can leave them stalled even if they escape actual frost damage.
No. Planting calendars provide a useful UK baseline, but local conditions can move practical sowing and planting dates earlier or later.
Exposure, frost pockets, soil type, elevation and urban warmth can all make a difference.
Look for areas where cold air can settle, particularly low ground, dips and the bottom of slopes.
If one part of your garden regularly frosts while higher or more sheltered areas nearby do not, it is likely behaving as a frost pocket.
Yes, depending on the crop.
Hardy vegetables such as peas and broad beans can cope with colder conditions than tender crops such as tomatoes, courgettes and French and runner beans. The last frost date is mainly a guide for judging risk rather than a date when all planting suddenly becomes safe.
Cold nights and cold soil can slow germination, root growth and establishment without causing visible frost damage.
That is why it is worth checking soil warmth, overnight temperatures and the forecast, rather than relying on the frost date alone.
