One of the hardest parts of running an allotment isn’t knowing what you want to grow. It’s knowing when to grow it.
The UK growing season doesn’t follow neat rules. Springs can be cold and slow, summers can be wet or dry without warning, and planting too early is just as likely to cause problems as planting too late. The result is that many allotments end up feeling rushed, overcrowded, or permanently behind.
This guide explains what to plant each month on a UK allotment, based on how the season actually behaves rather than how it looks on paper. It’s designed to help you plan calmly, avoid common timing mistakes, and make better decisions across the year.
How to use this guide
This is a month-by-month overview, not a set of instructions for individual crops.
Each section explains:
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what the month is good for
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what to focus on rather than forcing growth
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which crops realistically fit the conditions
For exact sowing depths, spacing, and care, use individual growing guides. This page is about timing, rhythm, and decision-making.
January: planning properly before anything grows
January is rarely about growing outdoors, but it’s one of the most important months of the allotment year.
Soils are cold, light levels are low, and very little will thrive outside. The real value of January is in planning. This is the month to decide what you’re growing, where it’s going, and how the year will flow.
Under cover, a small number of cold-tolerant crops can be started, such as onions from seed, early lettuce, or parsley. These are slow growers and benefit from an early start without being rushed.
Most successful allotment seasons are decided in January, even though very little is planted.
Find out what to plant in January
February: the season begins quietly
February is when the growing year starts to stir, but patience still matters.
Days are lengthening, but soil temperatures remain low and weather is unpredictable. This is a month for crops that tolerate cold and slow progress rather than fast growth.
Under cover, it’s a good time to start broad beans, lettuce, spinach, onions, and early peas. In milder areas, broad beans can be sown outdoors, but only if the ground is workable.
The biggest mistake in February is enthusiasm overtaking conditions. Strong starts now come from restraint, not volume.
Find out what to plant in February
March: the real starting line
March is when most allotment holders properly begin growing.
Soils slowly warm, light levels improve, and a much wider range of crops becomes viable. It’s also the month where mistakes start to show if things are rushed.
Under cover, this is when tender crops such as tomatoes, courgettes, cucumbers, and herbs are started. Outdoors, hardier vegetables like peas, broad beans, spinach, and parsnips can go in once the soil allows.
March is less about speed and more about sequencing. What you start now sets the pace for the rest of spring.
Find out what to plant in March
April: steady progress, not a sprint
April is when the allotment starts to feel active, but frost is still a risk.
This is a strong month for sowing directly outdoors, particularly root crops and salads. Carrots, beetroot, lettuce, onions, chard, and potatoes are all commonly planted now, provided soil conditions are right.
More tender crops can be started under cover, but they still need protection. April rewards growers who keep an eye on the weather rather than the calendar.
Succession sowing becomes important from this point onward.
Find out what to plant in April
May: peak sowing without the rush
May is one of the busiest months on the allotment, and for good reason.
Soils are warmer, daylight is long, and growth accelerates quickly. Most outdoor sowing happens now, including courgettes, runner beans, French beans, sweetcorn, salads, carrots, and beetroot.
Early May can still bring cold nights, so protection may be needed at first. By the end of the month, most beds should be active and the structure of the season becomes clear.
Overcrowding is the most common mistake in May. Space matters.
June: maintaining momentum
June is about keeping things moving rather than starting everything from scratch.
Harvests begin, gaps appear, and succession sowing keeps beds productive. This is a good month for continued sowings of carrots, beetroot, lettuce, chard, turnips, and French beans.
Watering, thinning, and spacing make more difference now than planting dates. June rewards attention more than ambition.
Find out what to plant in June
July: growing and planning at the same time
July is often seen as a harvesting month, but it’s also a key planning period.
As early crops finish, beds free up. This is the moment to think ahead rather than filling space randomly. Late sowings of carrots, beetroot, salads, spinach for autumn, and spring onions extend the season well beyond summer.
Many allotments lose momentum here because sowing stops too early. July keeps things going.
Find out what to plant in July
August: shifting towards autumn
August marks a change in focus.
Growth slows slightly, but conditions are still good for sowing crops that will carry into autumn and early winter. Spinach, chard, spring onions, turnips, and oriental greens all suit this period.
This is also the month to start thinking about soil recovery, bed rotation, and what won’t be replanted straight away.
Planning ahead now prevents wasted space later.
Find out what to plant in August
September: slowing down without stopping
September brings cooler nights and shorter days, but planting doesn’t end altogether.
Hardy salads, spinach, spring onions, overwintering onions, and green manures are all suitable choices. Growth is slower, but establishment is still reliable.
September is also a good month for tidying beds, adding compost, and preparing ground for winter crops.
Find out what to plant in September
October: preparing for winter structure
October is about resilience rather than speed.
Garlic, overwintering onions, and broad beans can be planted outdoors, particularly in milder areas. These crops establish slowly and benefit from winter conditions.
Clearing spent crops, mulching beds, and protecting soil become priorities. What you do now directly affects how easy spring will be.
Find out what to plant in October
November: minimal planting, maximum protection
November offers very few planting opportunities, and that’s normal.
Garlic and broad beans can still go in if conditions allow, but the focus shifts firmly to protecting what’s already growing. Mulching, covering soil, and preventing waterlogging matter more than sowing anything new.
This is a maintenance month, not a growth month.
Find out what to plant in November
December: rest, review, and reset
December is the quietest month on the allotment.
Very little is planted, and that’s exactly as it should be. This is the time to review what worked, what didn’t, and what you’d change next year.
Good planning in December makes the following spring far less stressful.
Find out what to plant in December
Why month-by-month planning makes everything easier
Most allotment problems come from reactive planting. Crops are squeezed in where there’s space, rotation breaks down, and beds become hard to manage.
Planning what to plant each month:
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improves crop rotation
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prevents overcrowding
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spreads workload across the year
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leads to more consistent harvests
Once you start thinking in seasons instead of individual crops, the whole allotment becomes easier to run.
Turning this into a proper plan
Knowing what to plant each month is useful. Seeing how it all fits together over a year is far more powerful.
When crops are planned visually, rotation becomes clearer, gaps are easier to spot, and decisions stop feeling rushed. This is where allotment planning stops being guesswork and starts becoming predictable.
Final thoughts
The UK growing year rewards timing, patience, and preparation.
If you understand what to plant each month — and plan ahead accordingly — you’ll waste less effort, lose fewer crops, and get far more from your allotment.
Use this guide as your seasonal overview. Let planning do the rest.