When to plant pumpkin in San Diego

Local planting windows for Pumpkin in San Diego. Frost-free days: 365. Pumpkin in San Diego is a good fit outdoors. The suitable growing window of 177 days covers the 90–120 days this plant usually needs.

Pumpkin

How to grow Pumpkin San Diego climate Weekly temperatures and windows

Where are you growing?

Tight fit

Tight fit in greenhouse

Tight fit in a cold frame

Pumpkin in San Diego is a good fit outdoors. The suitable growing window of 177 days covers the 90–120 days this plant usually needs.

When to plantSeptember 15 – November 9

Harvest: December 14 – March 9
Season vs crop: 177 grow days vs 90–120 needed

Pumpkin in San Diego is a good fit outdoors. The suitable growing window of 177 days covers the 90–120 days this plant usually needs.

Planting conditions

Direct sow
Grow outdoors
Harvest

Local activity windows for this place and growing method. Blue fill is usually too cold for this plant.

Suitable growing days in a row177

Days to harvest90–120 days from seed

Sep 15 – Nov 9

Direct sow

Nov 10 – Dec 13

Grow outdoors

Dec 14 – Mar 9

Harvest

Activity	Window	Notes
Direct sow	Sep 15 – Nov 9	Plant outdoors in this window.
Grow outdoors	Nov 10 – Dec 13	Plants grow outdoors until harvest.
Harvest	Dec 14 – Mar 9	Expected harvest from typical days to harvest.

Direct sow
Grow outdoors
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 (21 – 35 °C70 – 95 °F21 – 35 °C (70 – 95 °F)) and tolerable (16 – 38 °C61 – 100 °F16 – 38 °C (61 – 100 °F)) ranges.

Ideal / plantable
Tolerable
Too cold
Too hot
Outside window

Planting uses sow / plant-out rules; growing shows daytime air against this plant’s ideal and tolerable ranges.

Key dates

Frost-free days365

Outdoor sow dateSeptember 15

Direct sow windowSeptember 15 – November 9

Suitable growing windowApril 17 – October 10 (177 days)

Expected harvestDecember 14 – March 9

How these dates are judged

Ideal conditions: Daytime air from 21 – 35 °C70 – 95 °F21 – 35 °C (70 – 95 °F).
Suitable conditions: Daytime air from 16 – 38 °C61 – 100 °F16 – 38 °C (61 – 100 °F).
Last frost and first frost: Typical spring and fall frost dates for San Diego, shown in the key dates.
Days to harvest: 90–120 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. Air ratings on the weekly chart colour only weeks inside that same window — see weekly temperatures and windows.

Other plants for San Diego

Calculated by Plan & Plant. Method. Data 35 seasons (1991–2025).

Frost and suitability dates are typical figures from climate statistics.

Based on 35 years (1991–2025) of ERA5-Land data from Open-Meteo, for an area of about 10 km. Typical dates, not a guarantee.

Dates for San Diego use ERA5-Land cell 32.72, -117.16. How we calculated this · Algorithm 2026-10-season-10.

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