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When to plant onion in Dallas

How to grow OnionDallas climate
Where are you growing?

Comfortable

Tight fit in greenhouse

Comfortable in a cold frame

Onion in Dallas is a good fit outdoors. The suitable growing window of 135 days covers the 90–120 days this plant usually needs.

When to plantJanuary 16 – March 12

Harvest
April 16 – July 10
Season vs crop
135 grow days vs 90–120 needed
Typical frost (last spring – first fall)
February 27 – December 17

Onion in Dallas is a good fit outdoors. The suitable growing window of 135 days covers the 90–120 days this plant usually needs.

Planting conditions

Onion planting activities across the year: Direct sowJFMAMJJASOND~Feb 27~Dec 17
  • Direct sow
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 row135
Days to harvest90–120 days from seed
Jan 16 – Mar 12
Direct sow
ActivityWindowNotes
Direct sowJan 16 – Mar 12Plant outdoors in this window.
Blue fill is usually too cold for this plant. Dashed lines are typical last and first frost. 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 – 75 °F) and tolerable (39 – 86 °F) ranges.

Onion planting and growing weeks in DallasJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECPlantingGrowing
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

Typical last spring frostFebruary 27
Safer last spring frostFebruary 27
Typical first fall frostDecember 17
Safer first fall frostDecember 17
Frost-free days292
Outdoor sow dateJanuary 16
Direct sow windowJanuary 16 – March 12
Suitable growing windowJanuary 16 – May 30 (135 days)

How these dates are judged

Ideal conditions
Daytime air from 59 – 75 °F.
Suitable conditions
Daytime air from 39 – 86 °F.
Last frost and first frost
Typical spring and fall frost dates for Dallas, 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. The year strip and weekly chart use the same window: air ratings only colour weeks inside it.

Growing window for Onion: Jan 16 – May 30 (135 days)

Planting window for Onion: Jan 16 – Mar 12 (56 days)

Outdoors: weekly temperatures and windows

Temperatures across the year for Dallas. 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 4–30 °CTolerable 39–86 °FIdeal 15–24 °CIdeal 59–75 °FWindowGrowingJan 16 – May 30PlantingJan 16 – Mar 12Last frost ~Feb 27First frost ~Dec 17
  • 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 3 · Jan 12 – Jan 18

Average 38 to 58 °F · Possible 14 to 77 °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 86 °F; it is suitable when that average range also overlaps the ideal 59 to 75 °F band and possible readings stay within 39 °F to 86 °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 Dallas

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 32.78, -96.80, 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 Onion 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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