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When to plant lettuce in Phoenix

How to grow LettucePhoenix climate
Where are you growing?

Comfortable

Not realistic in greenhouse

Comfortable in a cold frame

Lettuce in Phoenix is a good fit outdoors. The suitable growing window of 83 days covers the 40–70 days this plant usually needs.

When to plantJanuary 10 – April 2

Harvest
February 19 – April 2
Season vs crop
83 grow days vs 40–70 needed

Lettuce in Phoenix is a good fit outdoors. The suitable growing window of 83 days covers the 40–70 days this plant usually needs.

Planting conditions

Lettuce 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 row83
Days to harvest40–70 days from seed
Jan 10 – Apr 2
Direct sow
Feb 19 – Apr 2
Harvest
ActivityWindowNotes
Direct sowJan 10 – Apr 2Plant outdoors in this window.
HarvestFeb 19 – Apr 2Expected 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 (59 – 70 °F) and tolerable (39 – 81 °F) ranges.

Lettuce 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 dateJanuary 10
Direct sow windowJanuary 10 – April 2
Suitable growing windowJanuary 10 – April 2 (83 days)
Expected harvestFebruary 19 – April 2

How these dates are judged

Ideal conditions
Daytime air from 59 – 70 °F.
Suitable conditions
Daytime air from 39 – 81 °F.
Last frost and first frost
Typical spring and fall frost dates for Phoenix, shown in the key dates.
Days to harvest
40–70 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 Lettuce: Jan 10 – Apr 2 (83 days)

Planting window for Lettuce: Jan 10 – Apr 2 (83 days)

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 4–27 °CTolerable 39–81 °FIdeal 15–21 °CIdeal 59–70 °FWindowGrowingJan 10 – Apr 2PlantingJan 10 – Apr 2No 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 2 · Jan 5 – Jan 11

Average 39 to 64 °F · Possible 28 to 71 °F

Growing: too cold

Planting: not sowable

A week is in range when its average low and high sit inside the tolerance band 39 to 81 °F; it is suitable when that average range also overlaps the ideal 59 to 70 °F band and possible readings stay within 39 °F to 81 °F. Crossing a possible limit, or missing the ideal band, makes it tolerable; a possible low below 39 °F makes it tolerable. 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 Lettuce 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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