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When to plant tomato in Toronto

How to grow TomatoToronto climate
Where are you growing?

Comfortable

Comfortable in greenhouse

Comfortable in a cold frame

Tomato in Toronto is a good fit outdoors. The suitable growing window of 116 days covers the 55–90 days this plant usually needs.

Start indoors
March 27 – April 26
Transplant outside
May 26 – June 25
Harvest
July 20 – September 18
Season vs crop
116 grow days vs 55–90 needed
Typical frost (last spring – first fall)
May 9 – October 31

Tomato in Toronto is a good fit outdoors. The suitable growing window of 116 days covers the 55–90 days this plant usually needs.

Planting conditions

Tomato planting activities across the year: Start indoors, Grow indoors, Harden off, Transplant outside, Grow outdoors, HarvestJFMAMJJASOND~May 9~Oct 31
  • 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 row116
Days to harvest55–90 days from transplant
Mar 27 – Apr 26
Start indoors
Apr 27 – May 18
Grow indoors
May 19 – May 25
Harden off
May 26
Transplant outside
May 27 – Jul 19
Grow outdoors
Jul 20 – Sep 18
Harvest
ActivityWindowNotes
Start indoorsMar 27 – Apr 26Sow indoors before the outdoor window.
Grow indoorsApr 27 – May 18Seedlings grow indoors until harden or transplant.
Harden offMay 19 – May 25Acclimate seedlings outdoors before planting.
Transplant outsideMay 26Move plants outside on this day (start of the plant-out window).
Grow outdoorsMay 27 – Jul 19Plants grow outdoors until harvest.
HarvestJul 20 – Sep 18Expected 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 TorontoJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECPlantingGrowing
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 9
Safer last spring frostMay 9
Typical first fall frostOctober 31
Safer first fall frostOctober 31
Frost-free days174
Earliest indoor seed startMarch 27
Latest indoor seed startApril 26
Transplant outdoorsMay 26 – June 25
Direct sow windownot recommended here
Suitable growing windowMay 26 – September 18 (116 days)
Expected harvestJuly 20 – September 18

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 Toronto, 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: May 26 – Sep 18 (116 days)

Planting window for Tomato: May 26 – Jun 25 (31 days)

Usually too cold: Jan 1 – May 24; Oct 5 – Dec 31

Outdoors: weekly temperatures and windows

Temperatures across the year for Toronto. 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−30 °C−22 °F−20 °C−4 °F−10 °C14 °F0 °C32 °F10 °C50 °F20 °C68 °F30 °C86 °FTolerable 13–35 °CTolerable 55–95 °FIdeal 21–29 °CIdeal 70–84 °FWindowGrowingMay 26 – Sep 18PlantingMay 26 – Jun 25Last frost ~May 9First frost ~Oct 31
  • 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 22 · May 25 – May 31

Average 11 to 19 °C · Possible 6 to 27 °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 Toronto

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 43.70, -79.40, 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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