Choose a common crop and a climate region to see its typical harvest window, indicative storage life for fresh, cellar, freezer, and dried storage, and a practical post-harvest tip.
These harvest months and storage times are climate averages for the selected region and are only a starting point. The actual date varies with the exact local microclimate, the specific variety grown, the altitude, and how the season's weather turns out from one year to the next. Always judge readiness by the crop itself, not by the calendar alone.
Why harvest dates shift across the UK
A single country rarely has one harvest date for a given crop. A maincrop potato lifted in Cornwall or the Channel Islands can be ready two to three weeks before the same variety grown in Aberdeenshire or the Pennines, simply because the soil warms up earlier near a mild coast. Altitude, aspect, and how sheltered a plot is all move the harvest window earlier or later, on top of the broad climate region a garden sits in. This tool gives a starting reference range for a temperate, continental, or Mediterranean climate, based on RHS-style seasonal guidance; treat it as a planning aid, not a fixed date.
Reference harvest window and storage life by crop (UK oceanic climate)
| Crop | Typical harvest | Fresh | Long-term storage | Freezer |
|---|---|---|---|---|
| Tomato | Aug to Sep | 5 to 7 days | Not recommended | 10 to 12 months |
| Maincrop potato | Sep to Oct | 2 to 3 weeks | 4 to 6 months (cellar/shed) | 10 to 12 months (cooked) |
| Carrot | Sep to Nov | 3 to 4 weeks | 4 to 6 months (sand box) | 10 to 12 months |
| Apple | Sep to Oct | 4 to 6 weeks | 3 to 5 months (cool loft) | 8 to 12 months |
| Onion | Aug to Sep | 2 to 4 weeks | 6 to 10 months (cured, plaited) | 8 to 12 months |
Limits of this reference guide
These ranges describe an average outcome for a UK garden, built from typical sowing and harvest calendars rather than a live weather forecast. A cold, wet spring or an early autumn frost can shift a real harvest by several weeks in either direction, and an early or late-cropping variety of the same vegetable can be ready well before or after the range shown here. Storage life also assumes a healthy, unbruised harvest kept at the right temperature and humidity in a shed or garage; damaged produce or a warm kitchen shortens every figure on this page. For how much a given plot might yield, see the Crop Yield Estimator, and for the seed-sowing side of the season, see the Seed Germination Guide.
Practical tip: curing before you store
Most root vegetables and alliums keep far longer if they are cured first: potatoes and onions lifted on a dry day benefit from a few days to a few weeks in a dry, airy shed so the outer skin toughens before going into long-term storage. Whatever the crop, sort out any bruised, cut, or diseased produce before it goes into a box or freezer bag, since a single damaged item speeds up spoilage in everything stored around it.