When to Plant Potatoes in the UK: Variety & Weather Guide

Illustration of potato grow bags and a basket of harvested vegetables

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Planting potatoes in the UK is primarily a spring activity, though the exact timing depends on the variety of potato and your local climate. To maximise your harvest, you must align your planting date with the variety’s growth cycle—categorised as first earlies, second earlies, or maincrops—while monitoring soil temperatures and frost risks. Generally, first earlies are planted in late March, second earlies in early to mid-April, and maincrops from mid-April to early May.

Table of Contents

Planting windows by potato variety

The timing of planting is dictated by how long a variety takes to mature and its susceptibility to weather conditions. The suggested windows help plan the season, but soil conditions and local weather matter more than a fixed date. Wait if the ground is waterlogged, frozen or too cold for growth.

First Earlies: These are planted around late March. They are the fastest growing and are typically ready for harvest in June and July.
Second Earlies: These go into the ground in early to mid-April, with harvests usually falling between July and August.
Maincrops: These are planted from mid-April to early May. They remain in the soil the longest, providing a larger harvest from late August through October.

Weather and regional adjustments

The dates provided above are general guidelines; however, UK weather varies significantly by region. Gardeners in milder southern areas can often plant slightly earlier, while those in colder northern regions or higher altitudes should plant later to avoid early spring frosts.

Young potato shoots are highly susceptible to frost damage in April and May. If freezing temperatures are forecast after shoots have emerged, they should be protected using cloches, hessian, straw, or a layer of garden compost. For those using containers, keeping plants in a frost-free greenhouse until the risk has passed is a safer alternative.

The role of chitting in timing

Chitting is the process of encouraging seed potatoes to sprout before they are planted. While not essential, it is highly beneficial for early varieties as it gives them a head start, leading to an even earlier crop.

For first and second early varieties, chitting should begin in late January for milder regions and up to early March in colder spots. The process typically takes four to six weeks. Chitting is performed by placing tubers in egg boxes or seed trays in a cool, bright location. There is generally no advantage to chitting maincrop varieties, as their longer growing season compensates for the lack of a head start.

Specialist planting for off-season harvests

It is possible to extend the potato harvest beyond the traditional summer window by using controlled environments or specific tuber types.

Extra early crops

To achieve a crop by mid-May, chitted early varieties can be planted at the beginning of March into large containers. These must be kept in a frost-free greenhouse with good light.

Christmas and winter crops

For a festive harvest, use cold-stored tubers purchased in July or August. These are seed potatoes from late winter that have been held back. In a frost-free greenhouse, conservatory, or bright porch, plant them in July or early August for the general RHS container method, checking the supplier’s specific instructions. Later planting leaves less growing time and is less reliable.

Planting specifications and spacing

Correct spacing is vital to ensure plants have enough nutrients and to make the subsequent process of “earthing up” easier. The method differs based on whether you are planting in the ground or in containers.

In-ground planting

Dig a trench approximately 15cm deep. Place seed potatoes along the base with sprouts facing upwards and cover with at least 2.5cm of soil. Spacing requirements are as follows:

Earlies: 30cm apart, with rows 60cm apart.
Maincrops: 37cm apart, with rows 75cm apart.

Container planting

Use a container at least 30cm wide and deep. Half-fill with 15cm of peat-free multi-purpose compost. Plant one seed potato per 30cm of pot diameter just below the surface. As the plant grows, gradually add more compost until it reaches just below the rim.

Diagnosis: When to adjust your timing

Monitoring the plants and the environment allows you to diagnose if your timing was correct or if intervention is needed:

Green Tubers: If tubers are exposed to light and turn green, they become poisonous. This is a sign that earthing up was delayed or the soil layer was too thin.
Blackened Foliage: If leaves turn black suddenly in late spring, this is often a sign of frost damage, so check the recent weather; disease and other damage can also darken foliage.
Blight Susceptibility: If you notice blight in a damp summer, remember that early varieties are generally less affected. If you are prone to blight, consider early varieties or varieties with useful blight resistance, and follow disease-specific advice.

Useful products for this job

The links below open Amazon UK product searches. Check the exact item, seller, current price and compatibility before buying.

Peat-free multi-purpose compost: Essential for planting potatoes in containers and as a mulch for no-dig ground planting. Ensure it is specifically multi-purpose and peat-free to meet environmental standards. Search Amazon for Peat-free multi-purpose compost.
Potato grow bags: Provides a viable alternative for gardeners without ground space, especially for early varieties. Check for drainage holes at the base and a harvesting flap for easier access. Search Amazon for Potato grow bags.

Related garden guides

Sources and further guidance

Guidance researched in September 2026. The feature image is an AI-generated illustration. Product guidance is based on published information, not hands-on testing.