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When to plant tomato in Leeds

How to grow TomatoLeeds climate
Where are you growing?

Tight fit

Tight fit in greenhouse

Comfortable in a cold frame

Tomato in Leeds is doable with planning outdoors. 66 suitable days are enough for fast varieties (55 days) but not slow ones (90 days).

Start indoors
April 12 – June 6
Transplant outside
June 11 – August 5
Harvest
August 5 – November 3
Season vs crop
66 grow days vs 55–90 needed
Typical frost (last spring – first fall)
May 14 – December 24

Tomato in Leeds is doable with planning outdoors. 66 suitable days are enough for fast varieties (55 days) but not slow ones (90 days).

Start seeds indoors April 12 – June 6, then transplant June 11 – August 5 so the crop can finish outdoors.

Planting conditions

Tomato planting activities across the year: Start indoors, Harden off, Transplant outside, Grow outdoors, HarvestJFMAMJJASOND~May 14~Dec 24
  • Start 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 row66
Days to harvest55–90 days from transplant
Apr 12 – Jun 6
Start indoors
Jun 4 – Jun 10
Harden off
June 11
Transplant outside
Jun 12 – Aug 4
Grow outdoors
Aug 5 – Nov 3
Harvest
ActivityWindowNotes
Start indoorsApr 12 – Jun 6Sow indoors before the outdoor window.
Harden offJun 4 – Jun 10Acclimate seedlings outdoors before planting.
Transplant outsideJune 11Move plants outside on this day (start of the plant-out window).
Grow outdoorsJun 12 – Aug 4Plants grow outdoors until harvest.
HarvestAug 5 – Nov 3Expected 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.

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.

Tomato planting and growing weeks in LeedsJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECPlantingGrowing
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 frostMay 14
Safer last spring frostMay 14
Typical first fall frostDecember 24
Safer first fall frostDecember 24
Frost-free days223
Earliest indoor seed startApril 12
Latest indoor seed startJune 6
Transplant outdoorsJune 11 – August 5
Direct sow windownot recommended here
Suitable growing windowJune 11 – August 15 (66 days)
Expected harvestAugust 5 – November 3

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
55–90 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 Tomato: Jun 11 – Aug 15 (66 days)

Planting window for Tomato: Jun 11 – Aug 5 (56 days)

Usually too cold: Jan 1 – Jun 7; 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.

JanFebMarAprMayJunJulAugSepOctNovDec−20 °C−4 °F−10 °C14 °F0 °C32 °F10 °C50 °F20 °C68 °F30 °C86 °F40 °C104 °FTolerable 13–35 °CTolerable 55–95 °FIdeal 21–29 °CIdeal 70–84 °FWindowGrowingJun 11 – Aug 15PlantingJun 11 – Aug 5Last frost ~May 14First frost ~Dec 24
  • 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 24 · Jun 8 – Jun 14

Average 10 to 18 °C · Possible 5 to 26 °C

Growing: too cold (inside window)

Planting: suitable

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 Tomato 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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