How to Protect Plants from Frost
Frost can damage tender leaves, buds, flowers and roots, particularly in clear, still weather. Protection does not need to be complicated: use shelter, insulation and good timing. Watch forecasts from autumn to spring, prepare coverings in advance, and prioritise tender plants, young seedlings and containers first.
Learn which parts of your garden are most frost-prone. Cold air settles in low areas, while plants near walls, hedges and fences may gain useful shelter. Check where frost appears first on clear mornings, and note whether containers stand exposed to wind. Tender plants, fresh spring growth and early-flowering fruit are often the highest priorities. Hardy plants usually recover from ordinary frost, though late shoots can still be damaged. Keep an eye on local forecasts, particularly from October through May, but use your own garden observations too. A sheltered town garden in the south may behave very differently from an exposed site in northern England, Wales or Scotland.
Move tender plants in pots before a cold night if you can. Place them in a greenhouse, porch, cold frame or other bright, frost-free space, ensuring they still have air movement. If indoor space is limited, group pots against a house wall where they are sheltered from wind and benefit from stored warmth. Raise containers on pot feet or wooden strips to improve drainage and reduce contact with frozen ground. Wrap the pot itself with insulating material, leaving drainage holes clear, because roots are more exposed in containers than in borders. Water lightly during mild spells, but avoid leaving compost saturated before a freeze.
Use horticultural fleece to cover vulnerable plants in borders and vegetable beds. Drape it loosely over hoops, canes or supports so foliage is not crushed, then secure the edges with pegs, soil or boards. Put it on before temperatures fall, ideally in late afternoon while plants are dry. Double layers can provide extra protection during a sharper cold spell, provided you remove or ventilate them when weather improves. Check the fleece after wind and rain, as wet, flattened material protects less well. Remove it during mild daylight hours when practical to give plants light and air, especially in a greenhouse or polytunnel.
Cloches are useful for small plants, early salads and young vegetables. Place a clear cloche over dry soil before the cold arrives, pushing its edge into the ground where possible. Ventilate on sunny days because temperatures inside can rise quickly even when the air feels cold. Use large clear containers with their bases removed only if drainage and ventilation are adequate, and secure them against wind. Do not seal wet foliage inside a cloche for long periods, as stagnant humidity can cause problems. For rows, a low tunnel of fleece is usually more practical than individual covers. Inspect plants each morning and remove damaged leaves with clean secateurs.
Protect the soil and roots with a loose organic mulch. Spread garden compost, leaf mould or well-rotted manure around established plants after the soil has cooled, keeping material away from stems and crowns. This buffers temperature changes and can reduce repeated freezing and thawing around roots. Mulch is especially useful for less hardy perennials and newly planted shrubs, though it will not make a truly tender plant survive severe cold unaided. In wet areas, make sure crowns remain well drained rather than buried beneath a heavy, soggy layer. Clear mulch back slightly in spring once weather warms and new growth needs space.
After frost, resist the urge to cut everything back immediately. Wait until growth has thawed and assess it over several days, as some plants recover from light damage. Remove blackened, collapsed or mushy growth only when it is clearly dead, using clean secateurs. Do not fertilise a stressed plant straight away; allow it to resume growth naturally when conditions improve. If further frost is forecast, keep protection ready and avoid uncovering tender plants too soon. In spring, harden off greenhouse-grown seedlings gradually before planting them out after the risk of the last spring frost has generally passed in your area.
Frequently asked questions
Should I water plants before a frost?
Do not water simply because frost is forecast. Saturated compost can worsen cold stress in containers and poorly drained beds. Water only if plants are genuinely dry and conditions are mild enough for moisture to drain. Prioritise shelter, fleece and good drainage instead.
Can fleece touch the leaves?
It can provide some protection when laid directly over sturdy crops, but a supported cover is safer for delicate foliage and flowers. Hoops or canes create a pocket of insulating air and stop wet fleece pressing on plants. Secure edges firmly against cold wind.
Why are pots more vulnerable than border plants?
Container roots are surrounded by a small volume of compost, which cools and freezes much faster than garden soil. Grouping pots, raising them for drainage, insulating their sides and moving tender specimens to shelter all reduce the risk of root damage.
General guidance for UK home gardens and allotments. Conditions vary by region, soil and season; the RHS or a local garden centre can give site-specific advice. Page updated 19 Sep 2026.