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When to plant zucchini in Los Angeles

How to grow ZucchiniLos Angeles climate
Where are you growing?

Tight fit

Not realistic in greenhouse

Tight fit in a cold frame

Zucchini in Los Angeles is a good fit outdoors. The suitable growing window of 171 days covers the 45–60 days this plant usually needs.

When to plantSeptember 1 – October 26

Harvest
October 16 – December 25
Season vs crop
171 grow days vs 45–60 needed

Zucchini in Los Angeles is a good fit outdoors. The suitable growing window of 171 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 row171
Days to harvest45–60 days from seed
Sep 1 – Oct 26
Direct sow
Oct 16 – Dec 25
Harvest
ActivityWindowNotes
Direct sowSep 1 – Oct 26Plant outdoors in this window.
HarvestOct 16 – Dec 25Expected 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 Los AngelesJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECPlantingGrowing
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 1
Direct sow windowSeptember 1 – October 26
Suitable growing windowMay 6 – October 23 (171 days)
Expected harvestOctober 16 – December 25

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 Los Angeles, 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: May 6 – Oct 23 (171 days)

Planting window for Zucchini: Sep 1 – Oct 26 (56 days)

Usually too cold: Jan 1 – May 3

Outdoors: weekly temperatures and windows

Temperatures across the year for Los Angeles. 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 °F50 °C122 °FTolerable 13–35 °CTolerable 55–95 °FIdeal 21–32 °CIdeal 70–90 °FWindowGrowingMay 6 – Oct 23PlantingSep 1 – Oct 26No 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 19 · May 4 – May 10

Average 54 to 77 °F · Possible 46 to 100 °F

Growing: too cold (inside window)

Planting: suitable

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 Los Angeles

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 34.05, -118.25, 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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