When to plant bell pepper in Leeds

Where are you growing?

Not realistic outdoors

Tight fit in greenhouse

Comfortable in a cold frame

Bell pepper in Leeds is a good fit under fleece. The suitable growing window of 87 days covers the 60–85 days this plant usually needs.

Start indoors: April 2 – May 27
Transplant outside: June 11 – August 5
Harvest: August 10 – October 29
Season vs crop: 87 grow days vs 60–85 needed
Typical frost (last spring – first fall): March 27 – December 25

Bell pepper in Leeds is a good fit under fleece. The suitable growing window of 87 days covers the 60–85 days this plant usually needs.

Estimate. Protection varies with the cover, the weather and how you vent it.

Fleece adds about 1–4 °C on frosty nights, depending on its weight. Remove it on warm days.

Fleece also cuts light: about 5–10 % for light fleece, up to 50–70 % for heavy grades. Take it off by day once frosts are over.

Cover dates are modelled from weather-model data using published greenhouse studies. They are not measured in your greenhouse. A max–min thermometer inside will tell you more.

Planting conditions

Start indoors
Grow indoors
Harden off
Transplant outside
Grow outdoors
Harvest

Local activity windows for this place and growing method. Blue fill is usually too cold for this plant. Dashed lines are typical last and first frost.

Suitable growing days in a row87

Days to harvest60–85 days from transplant

Apr 2 – May 27

Start indoors

May 28 – Jun 3

Grow indoors

Jun 4 – Jun 10

Harden off

June 11

Transplant outside

Jun 12 – Aug 9

Grow outdoors

Aug 10 – Oct 29

Harvest

Activity	Window	Notes
Start indoors	Apr 2 – May 27	Sow indoors before the outdoor window.
Grow indoors	May 28 – Jun 3	Seedlings grow indoors until harden or transplant.
Harden off	Jun 4 – Jun 10	Acclimate seedlings outdoors before planting.
Transplant outside	June 11	Move plants outside on this day (start of the plant-out window).
Grow outdoors	Jun 12 – Aug 9	Plants grow outdoors until harvest.
Harvest	Aug 10 – Oct 29	Expected harvest from typical days to harvest.

Blue fill is usually too cold for this plant. Dashed lines are typical last and first frost. Adjust a week or two for your conditions.

Protected frost and sowing dates are modelled estimates from weather-model data and published greenhouse studies, not measured in your greenhouse. A max–min thermometer inside will tell you more.

Planting and growing across the year

Planting is the sow / plant-out window. Growing is daytime air versus this plant’s ideal (21 – 29 °C) and tolerable (13 – 35 °C) ranges, from modelled cover temperatures for the growing method you selected.

Planting uses sow / plant-out rules (frost, soil germination, night, and last-sow): green when plantable, blue diagonal when nights or soil are too cold, amber cross-hatch when too hot, faint for other calendar limits. Growing shows daytime air against this plant’s ideal and tolerable ranges across the year.

Key dates

Typical last spring frostMarch 27

Safer last spring frostMarch 27

Typical first fall frostDecember 25

Safer first fall frostDecember 25

Frost-free days272

Earliest indoor seed startApril 2

Latest indoor seed startMay 27

Transplant outdoorsJune 11 – August 5

Direct sow windownot recommended here

Suitable growing windowJune 11 – September 5 (87 days)

Expected harvestAugust 10 – October 29

How these dates are judged

Ideal conditions: Daytime air from 21 – 29 °C.
Suitable conditions: Daytime air from 13 – 35 °C.
Last frost and first frost: Typical spring and fall frost dates for Leeds, shown in the key dates.
Days to harvest: 60–85 days from transplant, from typical days to harvest.
Sowing window: Dated sow and harvest bars use frost dates, soil minima, night limits, and last-sow count-back from typical crop timing. The year strip and weekly chart use the same window: air ratings only colour weeks inside it.

Growing window for Bell pepper: Jul 26 – Aug 15 (21 days)

Planting window for Bell pepper: Jul 26 – Aug 13 (19 days)

Usually too cold: Jan 1 – Jul 12; Aug 24 – Dec 31

Outdoors: weekly temperatures and windows

Temperatures across the year for Leeds. Shaded bands are this plant’s ideal and tolerable daytime air ranges. Growing is daytime air suitability; Planting is sow / plant-out conditions (same colour language). Window brackets mark each stretch.

Ideal range
Tolerable range
Possible min to max
Average min to max
Suitable
Tolerable
Too cold
Too hot

Selected week · tap a week or use the arrows

Week 30 · Jul 20 – Jul 26

Average 13 to 20 °C · Possible 9 to 26 °C

Growing: tolerable

Planting: too cold

A week is in range when its average low and high sit inside the tolerance band 13 to 35 °C; it is suitable when that average range also overlaps the ideal 21 to 29 °C band and possible readings stay within 0 °C to 35 °C. Crossing a possible limit, or missing the ideal band, makes it tolerable; any chance of frost (possible low below 0 °C) makes it too cold. When a sowing window is calculated, weeks outside that window are uncoloured even if air is in range.

Based on average frost dates.

Show all 53 weeks

Cover method weekly charts

Outdoor weekly chart is above. Open a cover chart only if you grow under fleece, a cold frame, or an unheated greenhouse.

Other plants for Leeds

Calculated by Plan & Plant · Method · Data 2019–2026

Frost and suitability dates are typical figures from climate statistics. Microclimates vary; they are not a guarantee.

How we calculated this

Data: ERA5-Land via Open-Meteo, cell 53.80, -1.55, years 2019–2026 (not a 30-year climate normal yet).
Typical and safer dates: Typical last frost is the date after which half of winters in this sample had no more frost; safer is later in the sample so fewer winters still frosted.
Crop rule: Local windows for Bell pepper from frost dates, temperature ratings, and crop timing rules.
Confidence: Provisional — short or thin sample for this place.
Full methodology (algorithm 2026-10-season-6).

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