UK Frost Dates 2026

When Is the Last Frost in the UK?

The last frost date is the average date after which frost is unlikely in your area. It’s the single most important date in a gardener’s calendar — it tells you when it’s safe to plant out tender seedlings, move houseplants outdoors and sow directly into the ground.

In the UK, last frost dates range from mid-March in sheltered southern coastal areas to late May or early June in the Scottish Highlands. Inner London rarely sees frost after mid-March thanks to the urban heat island effect. Rural areas on higher ground can be 2–4 weeks later than nearby towns.

Use our frost date calculator above to find the average last frost for your specific postcode area. Then check our planting calendar to see exactly what to sow and plant in each month for your region.

UK Frost Dates by Region

This table shows average frost dates across all 10 UK regions. Dates are based on Met Office historical data and represent typical years — in any given year the actual dates may be 2–3 weeks earlier or later.

Want month-by-month planting advice for your area? See our interactive planting calendar or browse the monthly guides: March, April, May, June, July.

Understanding Frost Types

Not all frosts are the same. Knowing the difference helps you decide how much protection your plants actually need.

Air frost vs ground frost

An air frost occurs when the air temperature at 1.25 metres above the ground drops below 0°C. A ground frost happens when the soil surface reaches 0°C, even if the air above is warmer. Ground frosts are far more common and can catch gardeners off guard — the BBC Weather may say 2°C, but your seedlings at ground level could still be frosted.

Light frost vs hard frost

A light frost (−1°C to 0°C) will damage tender annuals and soft new growth but won’t harm established hardy plants. A hard frost (below −4°C) can kill even semi-hardy plants and damage overwintering vegetables. The frost dates in our calculator are based on air frost records.

Radiation frost vs advection frost

Radiation frost forms on clear, calm nights when heat radiates away from the ground — these are the classic spring frosts that catch gardeners out. Advection frost is brought by cold air masses moving in from the east or north and can last days. Radiation frosts are predictable (check the evening forecast for clear skies); advection frosts arrive with weather systems.

Frost Pockets & Microclimates

Your garden’s actual frost dates may differ significantly from the regional average. Understanding microclimates is the key to extending your growing season.

What is a frost pocket?

Cold air is heavier than warm air and flows downhill like water. A frost pocket is any low-lying area where cold air collects and can’t drain away — valley floors, dips in the garden, areas blocked by walls or fences. Plants in frost pockets can experience frost 2–4 weeks later in spring and earlier in autumn than plants just metres away on higher ground.

Warm microclimates

A south-facing wall absorbs heat during the day and radiates it at night, creating a warm microclimate that can shift your frost dates by 2–3 weeks. Urban gardens benefit from the heat island effect — inner London rarely freezes before January. Coastal areas are moderated by the sea and stay frost-free longer than inland areas at the same latitude.

How to identify frost-prone spots

• Watch where dew or frost forms first on cold mornings — these are the coldest spots
• Low points in the garden where cold air pools are always the last to warm up
• North-facing slopes and areas shaded from morning sun stay cold longest
• Gaps in hedges or fences can funnel cold air into otherwise sheltered areas

How to Protect Plants from Frost

Even after your region’s average last frost date, late cold snaps can still catch you out. Here’s how to protect your plants.

1. Horticultural fleece

Drape horticultural fleece over tender plants when frost is forecast. It traps a layer of insulating air and can protect down to −3°C. Remove during the day to allow light and ventilation. Fleece is cheap and reusable for years.

2. Cloches and cold frames

Individual cloches protect individual plants, while cold frames shelter trays of seedlings. Both work by trapping daytime warmth. Prop them open on sunny days to prevent overheating.

3. Water the soil in the evening

Moist soil holds more heat than dry soil and releases it slowly overnight. Watering in the evening before a frost can raise the soil surface temperature by 1–2°C — enough to save seedlings from a light frost.

4. Harden off seedlings properly

Before transplanting indoor-raised seedlings outdoors, harden them off for 7–10 days. Start by placing them outside for 2 hours in a sheltered spot, increasing daily. By the end of the week they should cope with overnight temperatures above 5°C. Use our grass seed calculator to plan lawn repairs after winter damage.

Climate Change & UK Frost Dates

UK frost dates are shifting. According to the Met Office, England’s growing season has lengthened by approximately 29 days since the 1960s. Spring is arriving earlier and autumn lingering longer.

However, this doesn’t mean frost risk has disappeared. The “Beast from the East” in March 2018 brought hard frost and snow to southern England weeks after many gardeners had started planting out. Late cold snaps from Scandinavian or Russian air masses remain a threat through to May in most areas.

The safest approach: use the frost dates in our calculator as your baseline, then watch the 5-day BBC Weather or Met Office forecast before committing tender plants to the ground. If you need to calculate soil quantities for your growing project, try our compost calculator or topsoil calculator.

Frequently Asked Questions

Understanding Frost in the UK

I have been gardening in the UK for over 20 years, and if there is one thing I have learnt the hard way, it is that frost is never quite as simple as the forecast makes it sound. A “light frost overnight” on the BBC Weather can mean devastation for unprotected tomato seedlings or absolutely nothing for your established rosemary. Understanding the different types of frost, and the factors that determine when and where they strike, is the foundation of successful frost management.

Ground frost vs air frost

The Met Office distinguishes between two types of frost, and the difference matters enormously for gardeners. An air frost is recorded when the air temperature at the official measurement height of 1.25 metres above the ground drops below 0°C. A ground frost occurs when the temperature at the soil surface falls below 0°C, even if the air temperature at chest height remains above freezing. In practice, ground frosts are far more common — the Met Office records an average of 55 ground frost days per year across England compared to just 33 air frost days.

This distinction matters because your seedlings, newly planted plug plants, and low-growing salad crops sit at or near ground level, not at 1.25 metres. On a still, clear night the ground temperature can be 5–8°C colder than the air above it. So when the BBC Weather forecast says “2°C overnight,” the ground around your young courgette plants could easily be at −3°C or below. Always treat forecasts of 4°C or lower as a frost warning for vulnerable plants at ground level.

Radiation frost vs advection frost

Radiation frosts are the classic spring frosts that catch gardeners out year after year. They form on calm, clear nights when heat radiates upward from the ground into the atmosphere with nothing (no cloud cover, no wind) to trap it. The ground cools rapidly, the air directly above it chills, and by dawn your plants are coated in ice crystals. Radiation frosts are highly localised — one part of your garden may be frosted while another, sheltered by a wall or tree canopy, stays frost-free. They are also predictable: if the evening forecast shows clear skies, light winds and temperatures dropping below 4°C, expect a radiation frost.

Advection frosts are a different beast entirely. These occur when large masses of cold air sweep in from the Arctic, Scandinavia or Russia. The infamous “Beast from the East” events are advection frosts. They can last for days, bring temperatures well below −10°C, and affect the entire country regardless of local microclimates. Unlike radiation frosts, they arrive with wind, which makes them even more damaging as wind chill strips moisture from plant tissues. Thankfully, advection frosts are rare in late spring, but they can occur as late as April.

How altitude, coast and urban areas affect frost dates

Three factors shift your local frost dates more than anything else: altitude, proximity to the coast and the urban heat island effect.

• Altitude: As a general rule, temperature drops by roughly 0.6°C for every 100 metres of elevation gain. A garden at 200 metres above sea level is typically 1.2°C colder overnight than one at sea level in the same area. This can shift your last frost date by 2–3 weeks. Gardeners in the Pennines, the Welsh uplands and the Scottish hills should add at least a fortnight to the regional frost date averages.
• Coastal influence: The sea acts as a massive thermal store, warming slowly in spring and cooling slowly in autumn. Coastal gardens benefit from this buffering effect — the last frost arrives earlier and the first frost comes later compared to inland areas at the same latitude. Cornwall’s south coast, the Gower Peninsula, and parts of the Northumberland coast are all significantly milder than their inland counterparts. Falmouth averages just 7 air frost days per year.
• Urban heat island: Built-up areas generate and trap heat from buildings, roads, traffic and central heating. Inner London, central Manchester and central Birmingham are typically 2–4°C warmer overnight than surrounding rural areas. This means inner London’s last frost date is often mid-March, while gardens in the Surrey Hills just 30 miles south may not see their last frost until late April.

Typical frost dates by UK region

The table below summarises average frost dates across the UK. Use these as starting points, then adjust for your altitude, coastal proximity and whether you garden in an urban or rural setting.

How to Protect Plants from Frost — Step by Step

Frost protection is not about panicking every time the temperature drops. It is about knowing which plants need cover, choosing the right method and having your materials ready before you need them. Here is my practical guide, ranked from the simplest measures to the most involved.

Step 1: Know what needs protecting

Not everything in your garden is at risk. Hardy perennials, established shrubs and most trees will shrug off a typical UK frost without any help. The plants that need your attention are tender annuals (tomatoes, courgettes, runner beans, dahlias, begonias), recently transplanted seedlings of any type, tender perennials in pots (pelargoniums, fuchsias, agapanthus), and exotic plants (tree ferns, banana plants, olive trees in northern areas). If you are unsure, check the RHS hardiness rating — anything rated H3 or below needs winter or frost protection in most UK areas.

Step 2: Horticultural fleece (the gardener’s best friend)

A single layer of 30gsm horticultural fleece provides approximately 2–3°C of frost protection. For most spring frosts in southern and central England, that is enough. When the forecast shows temperatures dropping below −3°C, use a double layer for 4–5°C of protection. Drape the fleece loosely over plants (do not wrap tightly, as trapped moisture can freeze and cause more damage), and peg or weigh down the edges with stones so it does not blow off. Remove during the day to allow sunlight and airflow.

A 10-metre roll of 30gsm fleece costs around £8–£12 and lasts 3–4 seasons with careful handling. For larger beds and vegetable plots, buy a wider roll (1.5m or 2m wide) and cut to size. I keep two rolls in the shed at all times from March through to late May.

Step 3: Cloches for individual plants

If you only have a handful of plants to protect — newly planted tomatoes, a young courgette or a melon — individual cloches are ideal. Victorian bell cloches look beautiful, but cut-off plastic bottles work just as well in a pinch. Place the cloche over the plant in the late afternoon and remove it mid-morning once the air warms. On sunny days, even in spring, temperatures inside a cloche can soar above 30°C, so ventilation is critical.

Step 4: Cold frames for seedlings

A cold frame is essentially a bottomless box with a transparent lid. It traps solar heat during the day and releases it slowly overnight, providing 3–5°C of frost protection depending on the design. Cold frames are perfect for hardening off seedlings in April and May. Position them facing south, prop the lid open by 10cm on sunny days (above 15°C), and close it before sunset. A simple wooden cold frame with a polycarbonate lid costs £30–£60 and will last years.

Step 5: Mulch the crowns of tender perennials

For borderline-hardy plants that stay in the ground over winter — dahlias left in situ, agapanthus, ginger lilies, crocosmia — apply a thick layer of mulch over the crown once the foliage has died back. A 10–15cm layer of bark chippings, straw or well-rotted compost insulates the roots from the worst of the cold. Even if the top growth is killed by frost, the crown and roots remain protected and will reshoot in spring. I use our mulch calculator to work out exactly how much bark I need for the job.

Step 6: Move containers to sheltered spots

Container plants are far more vulnerable to frost than plants in the ground, because the roots are exposed to cold air on all sides rather than being insulated by surrounding soil. When frost is forecast, move pots against a south-facing or west-facing wall, cluster them together (so they share warmth), and wrap the pots themselves in bubble wrap or hessian to insulate the roots. The plant top can be covered with fleece. Raise terracotta pots off the ground with pot feet to prevent waterlogging and cracking.

Step 7: Water the soil before a frost

This sounds counterintuitive, but watering the soil in the late afternoon before a frost night actually helps. Moist soil has a higher thermal mass than dry soil and radiates more stored heat overnight. This can raise the air temperature at ground level by 1–2°C — often the difference between a damaging frost and a near-miss. Do not water the foliage, only the soil surface.

What to Do After a Late Frost

You woke up to find your garden white with frost in mid-May. The tomato transplants are blackened, the potato shoots have collapsed, and the dahlia foliage looks like wet tissue paper. Before you despair, take a breath. Many plants are tougher than they look, and a single frost rarely means total loss.

Assessing the damage

Do not rush to cut anything back immediately. Wait 24–48 hours for the full extent of the damage to become clear. Frost-damaged tissue will turn black, mushy or translucent, but it can take a day or two for the damage to show on woody stems and thicker growth. Water frosted plants gently in the morning to slow the thaw — rapid thawing in direct sunlight causes more cell damage than a gradual warm-up in shade.

Plants that usually recover

• Potatoes: The top growth may be blackened, but the tubers underground are unharmed. New shoots will emerge within 7–14 days. Earth up the new growth for extra protection.
• Established perennials: Hostas, hardy geraniums, delphiniums and most herbaceous perennials will regrow from the crown even if the top growth is destroyed. The root system is well-insulated by the surrounding soil.
• Fruit trees and bushes: Frosted blossom will not set fruit, but the tree itself is unharmed. You may lose this year’s crop on affected branches but the tree will fruit normally the following year.
• Roses: Frosted new growth and buds look devastating, but roses are remarkably resilient. New buds will break from lower nodes within 2–3 weeks.
• Lawns: Grass turns white with frost but recovers fully once temperatures rise. No action needed.

Plants that probably will not recover

• Tender annuals: Tomato transplants, courgettes, runner beans, French beans and basil are almost always killed outright by frost. These plants have no woody tissue and no below-ground reserves. You will need to re-sow or buy replacement plants.
• Bedding plants: Petunias, impatiens, begonias and lobelia recently planted out are unlikely to survive a hard frost. Replace them.
• Newly germinated seedlings: Very young seedlings of any type, even hardy ones, are vulnerable because they have not yet developed the cell structures that resist freezing.

How to prune frost-damaged growth

The golden rule is: wait until you see new growth emerging before you prune. This might mean waiting 3–4 weeks. Cutting back too early can expose the next layer of buds to a subsequent frost, and you may cut back more than necessary because you cannot yet see where the live tissue starts. Once new shoots appear, prune back to just above the highest live bud or leaf. Use sharp, clean secateurs and make angled cuts to shed rainwater.

For evergreen shrubs (pittosporum, hebe, ceanothus), resist the urge to tidy them up in spring. Wait until late May or even June to be sure no further frosts are coming, then prune back to healthy green growth. These plants often look dreadful for weeks after a frost but recover well with patience.

Frost-Hardy vs Frost-Tender Plants

The Royal Horticultural Society uses a hardiness rating system from H1 (tender, needs heated glass) to H7 (hardy in the harshest UK conditions). Understanding these ratings helps you decide which plants need protection, which can stay outdoors year-round, and which are simply not suited to your area without serious intervention.

The table below lists common UK garden plants with their RHS hardiness rating, the minimum temperature they tolerate, and whether they need frost protection in a typical UK winter.

For a full month-by-month guide to what you can safely sow and plant, see our interactive planting calendar, which adjusts recommendations based on your region.

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