When to plant tomato in Newcastle upon Tyne

How to grow Tomato Newcastle upon Tyne climate

Where are you growing?

Tight fit

Comfortable in greenhouse

Comfortable in a cold frame

Tomato in Newcastle upon Tyne is doable with planning outdoors. 68 suitable days are enough for fast varieties (55 days) but not slow ones (90 days).

Start indoors: April 10 – May 24
Transplant outside: June 9 – July 23
Harvest: August 3 – August 15
Season vs crop: 68 grow days vs 55–90 needed
Typical frost (last spring – first fall): May 14 – November 28

Tomato in Newcastle upon Tyne is doable with planning outdoors. 68 suitable days are enough for fast varieties (55 days) but not slow ones (90 days).

Start seeds indoors April 10 – May 24, then transplant June 9 – July 23 so the crop can finish outdoors.

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 row68

Days to harvest55–90 days from transplant

Apr 10 – May 24

Start indoors

May 25 – Jun 1

Grow indoors

Jun 2 – Jun 8

Harden off

June 9

Transplant outside

Jun 10 – Aug 2

Grow outdoors

Aug 3 – Aug 15

Harvest

Activity	Window	Notes
Start indoors	Apr 10 – May 24	Sow indoors before the outdoor window.
Grow indoors	May 25 – Jun 1	Seedlings grow indoors until harden or transplant.
Harden off	Jun 2 – Jun 8	Acclimate seedlings outdoors before planting.
Transplant outside	June 9	Move plants outside on this day (start of the plant-out window).
Grow outdoors	Jun 10 – Aug 2	Plants grow outdoors until harvest.
Harvest	Aug 3 – Aug 15	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.

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.

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 frostNovember 28

Safer first fall frostNovember 28

Frost-free days197

Earliest indoor seed startApril 10

Latest indoor seed startMay 24

Transplant outdoorsJune 9 – July 23

Direct sow windownot recommended here

Suitable growing windowJune 9 – August 15 (68 days)

Expected harvestAugust 3 – August 15

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 Newcastle upon Tyne, 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 9 – Aug 15 (68 days)

Planting window for Tomato: Jun 9 – Jul 23 (45 days)

Usually too cold: Jan 1 – Jun 7; Aug 24 – Dec 31

Outdoors: weekly temperatures and windows

Temperatures across the year for Newcastle upon Tyne. 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 24 · Jun 8 – Jun 14

Average 10 to 17 °C · Possible 7 to 22 °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 Newcastle upon Tyne

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 54.97, -1.61, 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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