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When to plant zucchini in San Diego

How to grow ZucchiniSan Diego climate
Where are you growing?

Tight fit

Tight fit in greenhouse

Comfortable in a cold frame

Zucchini in San Diego is a good fit outdoors. The suitable growing window of 203 days covers the 45–60 days this plant usually needs.

When to plantSeptember 15 – November 9

Harvest
October 30 – January 8
Season vs crop
203 grow days vs 45–60 needed

Zucchini in San Diego is a good fit outdoors. The suitable growing window of 203 days covers the 45–60 days this plant usually needs.

Planting conditions

Zucchini planting activities across the year: Direct sow, HarvestJFMAMJJASOND
  • Direct sow
  • Harvest
Local activity windows for this place and growing method. Blue fill is usually too cold for this plant.
Suitable growing days in a row203
Days to harvest45–60 days from seed
Sep 15 – Nov 9
Direct sow
Oct 30 – Jan 8
Harvest
ActivityWindowNotes
Direct sowSep 15 – Nov 9Plant outdoors in this window.
HarvestOct 30 – Jan 8Expected harvest from typical days to harvest.
Blue fill is usually too cold for this plant. 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 – 90 °F) and tolerable (55 – 95 °F) ranges.

Zucchini planting and growing weeks in San DiegoJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECPlantingGrowing
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

Frost-free days365
Outdoor sow dateSeptember 15
Direct sow windowSeptember 15 – November 9
Suitable growing windowApril 17 – November 5 (203 days)
Expected harvestOctober 30 – January 8

How these dates are judged

Ideal conditions
Daytime air from 70 – 90 °F.
Suitable conditions
Daytime air from 55 – 95 °F.
Last frost and first frost
Typical spring and fall frost dates for San Diego, shown in the key dates.
Days to harvest
45–60 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 Zucchini: Apr 17 – Nov 5 (203 days)

Planting window for Zucchini: Sep 15 – Nov 9 (56 days)

Usually too cold: Jan 1 – Apr 19

Outdoors: weekly temperatures and windows

Temperatures across the year for San Diego. 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−10 °C14 °F0 °C32 °F10 °C50 °F20 °C68 °F30 °C86 °F40 °C104 °FTolerable 13–35 °CTolerable 55–95 °FIdeal 21–32 °CIdeal 70–90 °FWindowGrowingApr 17 – Nov 5PlantingSep 15 – Nov 9No typical frost here. Timing follows heat, not frost.
  • 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 16 · Apr 13 – Apr 19

Average 53 to 65 °F · Possible 49 to 82 °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 90 °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 San Diego

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 32.72, -117.16, 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 Zucchini 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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