When to plant pumpkin in Phoenix

In Phoenix, typical last spring frost is January 17 and typical first fall frost is December 22. Typical last spring frost: January 17. Pumpkin in Phoenix is not realistic outdoors: 62 suitable days are fewer than the 90 days this plant usually needs.

Pumpkin

How to grow Pumpkin Phoenix climate Weekly temperatures and windows

Where are you growing?

Not realistic outdoors

Not realistic in greenhouse

Not realistic in a cold frame

Pumpkin in Phoenix is not realistic outdoors: 62 suitable days are fewer than the 90 days this plant usually needs.

When to plantApril 7 – June 1

Harvest: July 6 – September 29
Season vs crop: 62 grow days vs 90–120 needed
Typical frost (last spring – first fall): January 17 – December 22

Pumpkin in Phoenix is not realistic outdoors: 62 suitable days are fewer than the 90 days this plant usually needs.

Cover methods on this page (fleece, cold frame, unheated greenhouse) do not add enough season for this crop here. Pick another plant from the list below, or use a heated greenhouse.

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. Dashed lines are typical last and first frost.

Suitable growing days in a row62

Days to harvest90–120 days from seed

No planting window is recorded for this place.

Too cold
Frost line

Blue fill is usually too cold for this plant. Dashed lines are typical last and first frost (35 seasons (1991–2025)). 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

Typical last spring frostJanuary 17

Low-risk last spring frostFebruary 22

Typical first fall frostDecember 22

Low-risk first fall frostNovember 30

Frost-free days338

Outdoor sow dateApril 7

Direct sow windowApril 7 – June 1

Suitable growing windowApril 7 – June 7 (62 days)

Expected harvestJuly 6 – September 29

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 Phoenix, 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 Phoenix

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 Phoenix use ERA5-Land cell 33.45, -112.07. How we calculated this · Algorithm 2026-10-season-10.

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