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When to plant sweet corn in Phoenix

How to grow Sweet cornPhoenix climate
Where are you growing?

Tight fit

Comfortable in greenhouse

Comfortable in a cold frame

Sweet corn in Phoenix is a good fit outdoors. The suitable growing window of 90 days covers the 60–90 days this plant usually needs.

When to plantFebruary 22 – June 25; August 2 – September 11

Harvest
April 23 – September 23
Season vs crop
90 grow days vs 60–90 needed

Sweet corn in Phoenix is a good fit outdoors. The suitable growing window of 90 days covers the 60–90 days this plant usually needs.

Planting conditions

Sweet corn 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 row90
Days to harvest60–90 days from seed
Feb 22 – Jun 25
Direct sow
Apr 23 – Sep 23
Harvest
ActivityWindowNotes
Direct sowFeb 22 – Jun 25Plant outdoors in this window.
HarvestApr 23 – Sep 23Expected 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.

Sweet corn planting and growing weeks in PhoenixJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECPlantingGrowing
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 dateFebruary 22
Direct sow windowFebruary 22 – June 25
Suitable growing windowAugust 2 – October 30 (90 days)
Expected harvestApril 23 – September 23

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 Phoenix, shown in the key dates.
Days to harvest
60–90 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 Sweet corn: Feb 22 – May 18; Aug 2 – Oct 30 (176 days)

Planting window for Sweet corn: Feb 22 – Jun 25; Aug 2 – Sep 11 (165 days)

Usually too cold: Nov 2 – Dec 31

Outdoors: weekly temperatures and windows

Temperatures across the year for Phoenix. 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 °FWindowGrowingFeb 22 – May 18; Aug 2 – Oct 30PlantingFeb 22 – Jun 25; Aug 2 – Sep 11No 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 8 · Feb 16 – Feb 22

Average 44 to 71 °F · Possible 32 to 78 °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 Phoenix

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 33.45, -112.07, 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 Sweet corn 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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