When to plant broccoli in Charlotte

Where are you growing?

Comfortable

Tight fit in greenhouse

Comfortable in a cold frame

Broccoli in Charlotte is a good fit outdoors. The suitable growing window of 133 days covers the 55–75 days this plant usually needs.

Start indoors: December 7 – January 31
Transplant outside: January 25 – March 21
Harvest: March 21 – June 4
Season vs crop: 133 grow days vs 55–75 needed
Typical frost (last spring – first fall): March 8 – December 2

Broccoli in Charlotte is a good fit outdoors. The suitable growing window of 133 days covers the 55–75 days this plant usually needs.

Planting conditions

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 row133

Days to harvest55–75 days from transplant

Dec 7 – Jan 31

Start indoors

Jan 18 – Jan 24

Harden off

January 25

Transplant outside

Jan 26 – Mar 20

Grow outdoors

Mar 21 – Jun 4

Harvest

Activity	Window	Notes
Start indoors	Dec 7 – Jan 31	Sow indoors before the outdoor window.
Harden off	Jan 18 – Jan 24	Acclimate seedlings outdoors before planting.
Transplant outside	January 25	Move plants outside on this day (start of the plant-out window).
Grow outdoors	Jan 26 – Mar 20	Plants grow outdoors until harvest.
Harvest	Mar 21 – Jun 4	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 (59 – 75 °F) and tolerable (39 – 81 °F) 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 frostMarch 8

Safer last spring frostMarch 8

Typical first fall frostDecember 2

Safer first fall frostDecember 2

Frost-free days268

Earliest indoor seed startDecember 7

Latest indoor seed startJanuary 31

Transplant outdoorsJanuary 25 – March 21

Direct sow windownot recommended here

Suitable growing windowJanuary 25 – June 6 (133 days)

Expected harvestMarch 21 – June 4

How these dates are judged

Ideal conditions: Daytime air from 59 – 75 °F.
Suitable conditions: Daytime air from 39 – 81 °F.
Last frost and first frost: Typical spring and fall frost dates for Charlotte, 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: Jan 25 – Jun 6 (133 days)

Planting window for Broccoli: Jan 25 – Mar 21 (56 days)

Usually too cold: Nov 30 – Dec 27

Outdoors: weekly temperatures and windows

Temperatures across the year for Charlotte. 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 4 · Jan 19 – Jan 25

Average 32 to 48 °F · Possible 19 to 66 °F

Growing: too cold

Planting: not sowable

A week is in range when its average low and high sit inside the tolerance band 39 to 81 °F; it is suitable when that average range also overlaps the ideal 59 to 75 °F band and possible readings stay within 39 °F to 81 °F. Crossing a possible limit, or missing the ideal band, makes it tolerable; a possible low below 39 °F 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 Charlotte

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 35.23, -80.84, 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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