The first frost is one of those little signs that the gardening year is beginning to slow down. A crisp lawn in the morning can look beautiful, but a sudden drop in temperature can catch tender plants, newly planted specimens and container grown plants off guard.
Knowing when to expect the first frost and preparing your garden beforehand can make a big difference. From moving vulnerable pots into shelter to using garden fleece over tender plants, there are several simple ways to protect your garden from frost.
If you’re wondering when the first frost in the UK is, the answer varies considerably depending on where you live. Frost can arrive earlier in colder inland and rural areas, while coastal and urban areas are often milder. Rather than waiting for the first icy morning, it’s worth keeping an eye on the forecast and getting your frost protection ready in advance.
Here’s how to prepare your garden for the first frost and what you can do to protect your plants when temperatures start to fall.
When is the first frost in the UK?
There isn’t one set date for the first frost in the UK. The timing depends on where you live, your local climate and the weather conditions each autumn.
In many parts of the UK, the first frosts can arrive from October onwards, although some areas may stay frost free for considerably longer. Cold, clear nights are particularly likely to bring first, as temperatures can fall quickly once the sun goes down.
If you're wondering when the first frost in your area, your local weather forecast is the best guide. Keep an eye on overnight temperatures as autumn progresses, particularly if you’re growing tender plants or have recently planted anything that may be vulnerable to cold weather. Websites such as https://frostdates.com/ can be a useful tool for this.
You don't necessarily need to wait for a frost warning, either. If temperatures are forecast to fall towards freezing, it’s worth having you first protection ready to use.
When should I start protecting my plants from frost?
The simple answer is: before the first frost arrives
Waiting until you can see frost on the ground isn’t ideal, particularly for tender plants. If the forecast shows temperatures dropping close to 0 degrees overnight, start taking precautions.
It is particularly important to protect:
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Tender plants that are not fully hardy
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Young plants and newly planted specimens
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Plants in pots and containers
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Half hardy annuals and perennials
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Tender herbs and vegetables
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Citrus and other frost sensitive plants
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Plants that have been grown under cover and are not used to cold temperatures
You don't necessarily need to cover your entire garden. Most established, hardy plants will cope perfectly well with normal autumn and winter conditions. The aim is to identify the plants that are most vulnerable and give them some extra protection.
How to prepare your garden for the first frost
A little preparation now can save you from having to rush around the garden on the first particularly cold night.
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Bring tender potted plants somewhere sheltered
Container grown plants are generally more vulnerable to cold weather than plants growing in the ground because their roots have less insulation around them,
If you have tender plants growing in pots, consider moving them into a greenhouse, conservatory, porch, shed or another sheltered position before the weather turns properly cold.
A garage can also be suitable for some potted plants over winter, provided it is frost free and there is enough light for the plant if it needs to continue growing. However, not every plant will be happy in a dark garage for several months, so check the requirements of individual plants first.
You can also group pots together against a sheltered wall, which can provide some protection from cold winds.
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Use garden fleece to protect tender plants
Garden fleece is one of the simplest ways to protect plants from the frost.
It works by creating a layer of insulation around the plant, helping to reduce the impact of cold temperatures while still allowing air and moisture to circulate.
Is garden fleece useful for frost protection?
Yes. Horticultural fleece can provide useful frost protection, particularly for tender plants and young growth.
Drape the fleece loosely over the plant rather than wrapping it tightly around the foliage. Secure it at the base so that cold winds cannot easily blow it away, but avoid compressing the plant.
Fleece can be left in place temporarily during a period of cold weather, but remember to remove or open it during warmer days so that plants don't become excessively warm or humid.
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Does garden fleece let water through
Yes, garden fleece is generally permeable to both air and water, which is one of the reasons it is useful for protecting plants.
Rain and watering can reach soil and plant beneath the fleece, so you don't necessarily need to remove it every time you water. However, check the condition of the soil and the individual plant’s watering needs rather than watering automatically.
Fleece is also lightweight, so it is less likely to cause damage to plants than heavier materials placed directly over foliage.
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Protect the roots with mulch
Protecting the foliage isn’t the only way to prepare your garden for frost. Adding a layer of mulch around the base of plants can also help insulate the soil and protect roots from extreme fluctuation in temperature.
Well rotted compost, bark or other suitable organic mulch can be spread around plants in autumn.
Leave a little space around the base of stems and trunks rather than piling mulch directly against them, as well as providing some insulation, organic mulch can gradually break down and add valuable organic matter to the soil.
If you’re looking to improve your soil before winter, now is also a good time to work on its overall health. Read our complete guide to healthier garden soil.
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Move vulnerable containers off cold ground
Pots can become particularly cold during frosty weather, especially when they are sitting directly on paving or concrete.
If possible, raise containers slightly using pot feet, bricks or another suitable support. Moving them into a sheltered position beside a wall can also help.
For particularly vulnerable pots, wrapping the outside of the container with insulating material can provide additional protection for the roots.
What can I use instead of garden fleece?
If you don't have garden fleece available, there are other temporary ways to protect vulnerable plants.
For example, you can use:
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An old blanket or sheet during a particularly cold night
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A horticultural cloche
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An upturned plant pot
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A large cardboard box for short term overnight protection
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Bubble wrap around the outside of pots
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A greenhouse or cold frame for particularly tender plants
Whatever you use, make sure the material isn’t resting heavily on delicate foliage and that plants can still breathe
Can you use bubble wrap to protect plants from frost?
Bubble wrap can be useful for insulating plant pots, but it isn’t usually the best material to wrap directly around the foliage of a plant.
Wrapping the outside of a container with bubble wrap can help protect the roots from freezing temperatures. Leave the top of the pot and drainage holes clear so that excess water can escape.
For protecting the plant itself, horticultural fleece is generally a better option because it is designed for use around plants and allows air and moisture to circulate.
So if you’re wondering can I use bubble wrap to protect plants from frost? The answer is yes, but it is best used strategically around containers rather than wrapped tightly around plants.
Will cardboard boxes protect plants from frost?
A cardboard box can provide short term protection from a light frost, particularly if it is placed over a small plant overnight.
However, cardboard is not weatherproof, so it isn’t a practical long term solution to replace horticultural fleece. It can also become wet and collapse if exposed to rain.
If you do use a cardboard box, make sure it is removed during the day and isn’t left where it can become waterlogged.
Can plants survive one night of frost?
Many plants can survive a single light frost without any serious damage, particularly established hardy plants that are suited to the UK climate.
The risk is much greater for tender plants, young seedlings and plants that are not accustomed to cold temperatures. A sudden hard frost can cause significant damage to leaves, flowers and young shoots.
It is also worth remembering that frost damage isn’t always immediately obvious. Leaves may become limp, dark or discoloured after freezing temperatures, with the full extent of damage becoming clearer over the following days.
What to plant before the first frost
The first frost doesn’t mean you have to stop planting.
In fact, autumn is an excellent time to plant many hardy plants, including spring flowering bulbs, trees, shrubs and some perennials. The cooler weather and naturally wetter soil can help new plants establish their roots before the growing season begins again.
Need inspiration? Check our autumn planting guide!
Spring flowering bulbs
Autumn is one of the best times to plant spring flowering bulbs such as:
Many bulbs actually benefit from being planted before winter, giving them time to establish underground before putting on their display in spring.
If you’re planning ahead for next year’s colour, our spring bulb collection is a good place to start.
Trees and shrubs
Autumn is also a great time to plant many trees and shrubs, provided the ground isn’t frozen or waterlogged.
Planting while the soil is still relatively warm gives roots an opportunity to establish before spring growth begins.
Newly planted trees and shrubs may need some extra attention during their first winter particularly if they are young or exposed to strong winds.
Don’t forget your lawn before the first frost
Your lawn also benefits from a little preparation before winter.
Avoid walking repeatedly over frozen grass where possible. Frost can make grass blades brittle, meaning regular foot traffic across a frozen lawn can cause damage.
For more advice, take a look at our guide to autumn lawn care.
Autumn is also a good time to clear fallen leaves from the lawn. A thick layer of leaves can block light and air from reaching the grass and create damp conditions.
Instead of seeing the leaves you collect as garden waste, collect them and turn them into leaf mould. Keep them in damp and place them somewhere they can gradually break down such as a leaf mould bin, bag or wire enclosure.
For more information on making leaf mould see our complete guide on how to make leaf mould.
Protect outdoor taps and water features
Frost doesn’t only affect plants. Water that freezes inside pipes can expand and potentially cause damage.
Before temperatures regularly drop below freezing, disconnect hoses and drain outdoor taps and irrigation systems where possible.
If you have a pond or water feature, check that it is prepared for winter too. Avoid allowing the entire surface of a pond to become completely sealed by ice, as this can prevent gases from escaping.
Check the forecast rather than relying on the calendar
One of the best things you can do when preparing your garden for the first frost is simply to keep an eye on the weather.
There is no exact date for when the first frost will arrive, and temperatures can vary significantly from one garden to another. A sheltered urban garden may remain first free while a more exposed garden only a few miles away experiences a frost.
Pay particular attention to overnight temperatures and clear, still nights. If frost is forecast. That’s your cue to bring tender pots under cover and put your fleece and other protection in place.
A simple first frost checklist
If temperatures are starting to fall, work through this quick checklist:
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Check the overnight forecast
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Identify your tender and frost sensitive plants
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Bring vulnerable potted plants somewhere sheltered
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Cover tender plants with horticultural fleece
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Add mulch around vulnerable plants
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Protect containers from cold and wind
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Wrap pots with insulating material if needed
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Drain hoses and protect outdoor water systems
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Clear leaves from lawns
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Avoid walking on frozen grass
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Check young plants and newly planted trees and shrubs
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Remove temporary covers during milder weather
The first frost doesn’t have to signal the end of the gardening season. For many gardeners, it is simply a reminder to shift focus towards protecting what's already growing and planning for the months ahead.
With a little preparation, most established garden plants will cope perfectly well with winter. The key is knowing which plants need extra help, having your first protection ready before the temperatures drop and making the most of autumn while the soil is still workable.