In the UK, sow runner beans indoors in pots during April or May, or direct outdoors from mid-May in the south (early June further north) once soil reaches 12°C — frost kills the plants outright. Harvest begins in July from indoor-raised plants, continuing through October.
Last updated 4 July 2026
Sowing dates, regional timing, and variety picks for growing runner beans successfully across the UK.
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Sowing dates and growing advice verified against RHS guidance by the SoilCommander Growing Team.
Sowing & Planting Dates
| Method | When | Notes |
|---|---|---|
| Sow indoors (pots) | Late April – mid-May | 5cm deep, one per pot; 18–21°C; germination 7–14 days |
| Transplant outdoors | Late May – early June | After last frost; soil 12°C+ |
| Direct sow outdoors | Mid-May – mid-June | Only when soil is reliably warm; cover with fleece if nights are cold |
| Harvest begins | July (indoor-started) / Aug (direct) | Pick at 15–20cm every 2–3 days |
Regional Planting Notes
The RHS gives region-specific outdoor sowing dates: soil reaches the 12°C runner beans need “usually by mid-May in the south of the UK” but not until “early June in the north” — matching the Met Office’s finding that the last frost further north can extend “well into May and, in a few places, even into June.” Gardeners in Scotland and colder inland areas do better starting seed indoors instead, which “provides a longer growing season” than waiting for outdoor conditions.
Top Varieties
- Enorma — RHS AGM, very long pods, excellent flavour
- Scarlet Emperor — classic, vigorous, vivid scarlet flowers
- Hestia — compact dwarf (45cm), no staking, good for containers and northern gardens
- White Lady — AGM, white-flowered, stringless, less attractive to birds
Common Mistakes to Avoid
- Sowing or planting out before soil reaches 12°C. Runner beans won't survive frost — keep plants indoors until after the last frost and soil has properly warmed.
- Letting plants dry out. These large, vigorous plants need plenty of moisture to crop well — water regularly, especially in dry spells.
- Leaving mature pods unpicked. Once pods are left too long, plants stop flowering and no more pods will form — pick every 2–3 days to keep the crop coming.
Frequently Asked Questions
Why aren't my runner beans setting pods?
Failure to set pods, particularly early in the season, is a surprisingly widespread problem, usually weather-related — ensure regular watering and good pollinator access.
Which runner bean variety copes best with hot summers?
Varieties with French bean parentage, such as 'Firelight' and 'Moonlight', are recommended for regions that get hot summers, since standard types can struggle to set pods in heat.
When should I sow runner beans outdoors — does it differ across the UK?
Yes — soil reaches the required 12°C by mid-May in the south but not until early June in the north; colder areas do better sowing indoors first for a longer season.
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