What garden jobs have to be done before the first frost?
The short list of jobs with a genuine deadline rather than a preference — what the first frost destroys, in the order it destroys it, so nothing is lost to a night you did not see coming.
- Difficulty
- beginner
- Time
- 3 hr
- Read
- 4 min
Short answer
Everything on this list is undone by one night: lift tender tubers and bring tender pot plants under cover, pick the last of the tender crops, take cuttings of anything you want to keep, drain and disconnect anything that holds water outside, and empty saucers and raise pots. Everything else people do in autumn — mulching, clearing, tool care — has no deadline and can wait.
Do this first
Autumn garden advice tends to be a long undifferentiated list, which means the two or three genuinely time-critical items get lost among the optional ones. This is only the deadline list: things where the first frost is the point of no return.
Step by step
- Work out when your first frost date is.That is the deadline. Without it you are guessing, and the whole point of this list is that it has one.
- Deal with tender tubers and pot plants first.Dahlias, cannas, begonias, pelargoniums, fuchsias, salvias and similar. These are the highest-value items and the ones a single night removes permanently. Tubers can be lifted after the tops are blackened; pot plants need to be in before the frost, not after.
- Take insurance cuttings early.Cuttings of tender perennials root far better taken in late summer than in autumn, and they mean that losing the parent plant is an inconvenience rather than a loss. This is the item most often left too late.
- Harvest everything tender.Tomatoes green or ripe, courgettes, French and runner beans, basil, squash. Green tomatoes ripen indoors or become chutney; on the plant after a frost they are compost.
- Protect the water systems.Outside taps isolated and drained, hoses emptied and coiled indoors, watering cans upended, water features drained or the pump removed. Water expands as it freezes and splits whatever contains it.
- Sort out the pots.Empty saucers, raise pots onto feet, move terracotta and anything not frost-proof under cover, and group what stays out against a wall. A pot full of saturated compost that freezes solid splits the pot and kills the roots.
- Find the fleece before you need it.The first frost is often unforecast in any personally memorable way, and searching a dark shed for fleece at nine at night is how plants get lost.
- Then stop.Mulching, cutting back, leaf clearing, tool cleaning, digging and planting all have weeks or months of latitude. Doing them in a rush before a frost achieves nothing and crowds out the jobs that mattered.
Tips
- The first frost of autumn is often a single sharp night followed by weeks of mild weather. Losing tender plants to it is particularly annoying because the season was not actually over.
- A tender pot plant brought in a fortnight early loses nothing. One brought in a night late loses everything. The asymmetry is the whole argument for doing this early.
- Green tomatoes ripen perfectly well indoors in a paper bag with a banana, or make chutney. Do not leave them out hoping for another week of sun.
- Label tubers as you lift them. Every dahlia looks identical in a box in February.
- If you have an outside tap with an isolating valve indoors, find it before winter rather than during a freeze.
Common mistakes
- Treating the whole autumn job list as urgent — It dilutes attention away from the handful of jobs that genuinely have a deadline. Almost everything else in autumn can be done at any point over several months.
- Waiting for frost to blacken dahlia tops before doing anything at all — That works for lifting tubers, which are underground and unaffected. It does not work for pot plants, cuttings or crops, all of which have to be dealt with before the frost.
- Leaving pots standing in saucers over winter — The saucer holds water, the compost saturates and freezes solid, and the pot splits and the roots die. Emptying saucers takes two minutes and saves plants and pots.
Checklist
- Lift dahlia, canna, begonia and other tender tubers once frost has blackened the tops, or before it if you cannot risk waiting
- Move tender container plants under cover — greenhouse, porch, conservatory, shed or indoors
- Take cuttings of tender perennials you want to keep, well before the frost rather than after it
- Pick the last tomatoes, courgettes, beans, squash and basil
- Bring in any squash and pumpkins that are ready, and cure them somewhere dry
- Cut and dry or freeze the last of the tender herbs
- Empty and turn off outside taps and drain the hose
- Drain and store anything that holds water — watering cans, sprayers, pump features, ceramic pots left full
- Empty pot saucers and raise pots onto feet so they drain rather than freeze solid
- Move terracotta and any pot not rated frost-proof under cover or empty it
- Check that greenhouse and cold frame glazing is secure and vents close properly
- Get fleece out of storage and put it somewhere you can find it in the dark
Questions people ask
What if I miss it and get frosted?
Tubers underground are usually fine and can still be lifted. Tender top growth is gone. Leave frosted growth in place for a few days rather than cutting immediately, and check what has actually died before clearing.
Should I cut everything back at the same time?
No, and mostly not at all. Standing stems shelter crowns from winter rain, provide habitat, and look far better through winter than bare soil. Cut in late winter instead, with the specific exceptions of plants that genuinely need autumn cutting.
Does this list apply to a greenhouse?
Partly — securing glazing and vents does, and moving tender plants into it is the point of several items. Frost-proofing a greenhouse itself is a separate job with its own considerations.