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When to plant cucumber in Toronto

How to grow CucumberToronto climate
Where are you growing?

Comfortable

Comfortable in greenhouse

Comfortable in a cold frame

Cucumber in Toronto is a good fit outdoors. The suitable growing window of 109 days covers the 50–70 days this plant usually needs.

When to plantJune 2 – July 15

Harvest
July 22 – September 18
Season vs crop
109 grow days vs 50–70 needed
Typical frost (last spring – first fall)
May 9 – October 31

Cucumber in Toronto is a good fit outdoors. The suitable growing window of 109 days covers the 50–70 days this plant usually needs.

Planting conditions

Cucumber planting activities across the year: Direct sowJFMAMJJASOND~May 9~Oct 31
  • Direct sow
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 row109
Days to harvest50–70 days from seed
Jun 2 – Jul 15
Direct sow
ActivityWindowNotes
Direct sowJun 2 – Jul 15Plant outdoors in this window.
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 – 32 °C) and tolerable (13 – 35 °C) ranges.

Cucumber 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
Outdoor sow dateJune 2
Direct sow windowJune 2 – July 15
Suitable growing windowJune 2 – September 18 (109 days)

How these dates are judged

Ideal conditions
Daytime air from 21 – 32 °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
50–70 days from seed, 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 Cucumber: Jun 2 – Sep 18 (109 days)

Planting window for Cucumber: Jun 2 – Jul 15 (44 days)

Usually too cold: Jan 1 – May 31; 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 21–32 °CIdeal 70–90 °FWindowGrowingJun 2 – Sep 18PlantingJun 2 – Jul 15Last 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 23 · Jun 1 – Jun 7

Average 14 to 22 °C · Possible 8 to 29 °C

Growing: suitable

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 32 °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 Cucumber 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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