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When to plant bell pepper in Detroit

How to grow Bell pepperDetroit climate
Where are you growing?

Comfortable

Not realistic in greenhouse

Comfortable in a cold frame

Bell pepper in Detroit is a good fit outdoors. The suitable growing window of 119 days covers the 60–85 days this plant usually needs.

Start indoors
March 15 – April 13
Transplant outside
May 24 – June 22
Harvest
July 23 – September 15
Season vs crop
119 grow days vs 60–85 needed
Typical frost (last spring – first fall)
May 9 – November 2

Bell pepper in Detroit is a good fit outdoors. The suitable growing window of 119 days covers the 60–85 days this plant usually needs.

Planting conditions

Bell pepper planting activities across the year: Start indoors, Grow indoors, Harden off, Transplant outside, Grow outdoors, HarvestJFMAMJJASOND~May 9~Nov 2
  • 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 row119
Days to harvest60–85 days from transplant
Mar 15 – Apr 13
Start indoors
Apr 14 – May 16
Grow indoors
May 17 – May 23
Harden off
May 24
Transplant outside
May 25 – Jul 22
Grow outdoors
Jul 23 – Sep 15
Harvest
ActivityWindowNotes
Start indoorsMar 15 – Apr 13Sow indoors before the outdoor window.
Grow indoorsApr 14 – May 16Seedlings grow indoors until harden or transplant.
Harden offMay 17 – May 23Acclimate seedlings outdoors before planting.
Transplant outsideMay 24Move plants outside on this day (start of the plant-out window).
Grow outdoorsMay 25 – Jul 22Plants grow outdoors until harvest.
HarvestJul 23 – Sep 15Expected 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 (70 – 84 °F) and tolerable (55 – 95 °F) ranges.

Bell pepper planting and growing weeks in DetroitJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECPlantingGrowing
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 frostNovember 2
Safer first fall frostNovember 2
Frost-free days176
Earliest indoor seed startMarch 15
Latest indoor seed startApril 13
Transplant outdoorsMay 24 – June 22
Direct sow windownot recommended here
Suitable growing windowMay 24 – September 19 (119 days)
Expected harvestJuly 23 – September 15

How these dates are judged

Ideal conditions
Daytime air from 70 – 84 °F.
Suitable conditions
Daytime air from 55 – 95 °F.
Last frost and first frost
Typical spring and fall frost dates for Detroit, shown in the key dates.
Days to harvest
60–85 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 Bell pepper: May 24 – Sep 19 (119 days)

Planting window for Bell pepper: May 24 – Jun 22 (30 days)

Usually too cold: Oct 5 – Dec 31

Outdoors: weekly temperatures and windows

Temperatures across the year for Detroit. 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 °FTolerable 13–35 °CTolerable 55–95 °FIdeal 21–29 °CIdeal 70–84 °FWindowGrowingMay 24 – Sep 19PlantingMay 24 – Jun 22Last frost ~May 9First frost ~Nov 2
  • 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 21 · May 18 – May 24

Average 55 to 71 °F · Possible 40 to 87 °F

Growing: too cold

Planting: too cold

A week is in range when its average low and high sit inside the tolerance band 55 to 95 °F; it is suitable when that average range also overlaps the ideal 70 to 84 °F band and possible readings stay within 32 °F to 95 °F. Crossing a possible limit, or missing the ideal band, makes it tolerable; any chance of frost (possible low below 32 °F) 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 Detroit

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 42.33, -83.05, 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 Bell pepper 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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