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When to plant broccoli in Edmonton

How to grow BroccoliEdmonton climate
Where are you growing?

Comfortable

Comfortable in greenhouse

Comfortable in a cold frame

Broccoli in Edmonton is a good fit outdoors. The suitable growing window of 162 days covers the 55–75 days this plant usually needs.

Start indoors
March 8 – May 2
Transplant outside
April 26 – June 20
Harvest
June 20 – September 3
Season vs crop
162 grow days vs 55–75 needed
Typical frost (last spring – first fall)
May 13 – October 14

Broccoli in Edmonton is a good fit outdoors. The suitable growing window of 162 days covers the 55–75 days this plant usually needs.

Planting conditions

Broccoli planting activities across the year: Start indoors, Harden off, Transplant outside, Grow outdoors, HarvestJFMAMJJASOND~May 13~Oct 14
  • 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 row162
Days to harvest55–75 days from transplant
Mar 8 – May 2
Start indoors
Apr 19 – Apr 25
Harden off
April 26
Transplant outside
Apr 27 – Jun 19
Grow outdoors
Jun 20 – Sep 3
Harvest
ActivityWindowNotes
Start indoorsMar 8 – May 2Sow indoors before the outdoor window.
Harden offApr 19 – Apr 25Acclimate seedlings outdoors before planting.
Transplant outsideApril 26Move plants outside on this day (start of the plant-out window).
Grow outdoorsApr 27 – Jun 19Plants grow outdoors until harvest.
HarvestJun 20 – Sep 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 (15 – 24 °C) and tolerable (4 – 27 °C) ranges.

Broccoli planting and growing weeks in EdmontonJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECPlantingGrowing
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 13
Safer last spring frostMay 13
Typical first fall frostOctober 14
Safer first fall frostOctober 14
Frost-free days153
Earliest indoor seed startMarch 8
Latest indoor seed startMay 2
Transplant outdoorsApril 26 – June 20
Direct sow windownot recommended here
Suitable growing windowApril 26 – October 4 (162 days)
Expected harvestJune 20 – September 3

How these dates are judged

Ideal conditions
Daytime air from 15 – 24 °C.
Suitable conditions
Daytime air from 4 – 27 °C.
Last frost and first frost
Typical spring and fall frost dates for Edmonton, shown in the key dates.
Days to harvest
55–75 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 Broccoli: Apr 26 – Oct 4 (162 days)

Planting window for Broccoli: Apr 26 – Jun 20 (56 days)

Usually too cold: Oct 12 – Dec 31

Outdoors: weekly temperatures and windows

Temperatures across the year for Edmonton. 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−50 °C−58 °F−40 °C−40 °F−30 °C−22 °F−20 °C−4 °F−10 °C14 °F0 °C32 °F10 °C50 °F20 °C68 °F30 °C86 °FTolerable 4–27 °CTolerable 39–81 °FIdeal 15–24 °CIdeal 59–75 °FWindowGrowingApr 26 – Oct 4PlantingApr 26 – Jun 20Last frost ~May 13First frost ~Oct 14
  • 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 17 · Apr 20 – Apr 26

Average −1 to 12 °C · Possible −6 to 19 °C

Growing: too cold

Planting: too cold

A week is in range when its average low and high sit inside the tolerance band 4 to 27 °C; it is suitable when that average range also overlaps the ideal 15 to 24 °C band and possible readings stay within 4 °C to 27 °C. Crossing a possible limit, or missing the ideal band, makes it tolerable; a possible low below 4 °C makes it tolerable. 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 Edmonton

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 53.55, -113.47, 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 Broccoli 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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