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When to plant spinach in Houston

How to grow SpinachHouston climate
Where are you growing?

Comfortable

Not realistic in greenhouse

Comfortable in a cold frame

Spinach in Houston is a good fit outdoors. The suitable growing window of 89 days covers the 35–50 days this plant usually needs.

When to plantJanuary 18 – April 25; October 22 – November 9

Harvest
February 22 – March 24
Season vs crop
89 grow days vs 35–50 needed

Spinach in Houston is a good fit outdoors. The suitable growing window of 89 days covers the 35–50 days this plant usually needs.

Planting conditions

Spinach planting activities across the year: Direct sow, HarvestJFMAMJJASOND
  • Direct sow
  • Harvest
Local activity windows for this place and growing method.
Suitable growing days in a row89
Days to harvest35–50 days from seed
Jan 18 – Apr 25
Direct sow
Feb 22 – Mar 24
Harvest
ActivityWindowNotes
Direct sowJan 18 – Apr 25Plant outdoors in this window.
HarvestFeb 22 – Mar 24Expected harvest from typical days to harvest.
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 – 75 °F) ranges.

Spinach planting and growing weeks in HoustonJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECPlantingGrowing
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 18
Direct sow windowJanuary 18 – April 25
Suitable growing windowOctober 22 – January 18 (89 days)
Expected harvestFebruary 22 – March 24

How these dates are judged

Ideal conditions
Daytime air from 59 – 70 °F.
Suitable conditions
Daytime air from 39 – 75 °F.
Last frost and first frost
Typical spring and fall frost dates for Houston, shown in the key dates.
Days to harvest
35–50 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 Spinach: Jan 1 – Mar 24; Oct 22 – Jan 18 (172 days)

Planting window for Spinach: Jan 18 – Apr 25; Oct 22 – Nov 9 (117 days)

Outdoors: weekly temperatures and windows

Temperatures across the year for Houston. 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−20 °C−4 °F−10 °C14 °F0 °C32 °F10 °C50 °F20 °C68 °F30 °C86 °F40 °C104 °FTolerable 4–24 °CTolerable 39–75 °FIdeal 15–21 °CIdeal 59–70 °FWindowGrowingJan 1 – Mar 24; Oct 22 – Jan 18PlantingJan 18 – Apr 25; Oct 22 – Nov 9No 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 1 · Jan 1 – Jan 4

Average 49 to 65 °F · Possible 32 to 82 °F

Growing: tolerable

Planting: not sowable

A week is in range when its average low and high sit inside the tolerance band 39 to 75 °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 75 °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 Houston

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 29.76, -95.37, 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 Spinach 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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