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When to plant radish in San Antonio

How to grow RadishSan Antonio climate
Where are you growing?

Comfortable

Comfortable in greenhouse

Tight fit in a cold frame

Radish in San Antonio is a good fit outdoors. The suitable growing window of 127 days covers the 22–35 days this plant usually needs.

When to plantJanuary 23 – April 5; October 28 – November 29

Harvest
February 14 – May 7
Season vs crop
127 grow days vs 22–35 needed
Typical frost (last spring – first fall)
February 11 – January 7

Radish in San Antonio is a good fit outdoors. The suitable growing window of 127 days covers the 22–35 days this plant usually needs.

Planting conditions

Radish planting activities across the year: Direct sow, HarvestJFMAMJJASOND~Feb 11~Jan 7
  • Direct sow
  • Harvest
Local activity windows for this place and growing method. Dashed lines are typical last and first frost.
Suitable growing days in a row127
Days to harvest22–35 days from seed
Jan 23 – Apr 5
Direct sow
Feb 14 – May 7
Harvest
ActivityWindowNotes
Direct sowJan 23 – Apr 5Plant outdoors in this window.
HarvestFeb 14 – May 7Expected harvest from typical days to harvest.
Based on average frost dates. 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 – 81 °F) and tolerable (39 – 86 °F) ranges.

Radish planting and growing weeks in San AntonioJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECPlantingGrowing
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 11
Safer last spring frostMarch 6
Typical first fall frostJanuary 7
Safer first fall frostDecember 26
Frost-free days329.5
Outdoor sow dateJanuary 23
Direct sow windowJanuary 23 – April 5
Suitable growing windowJanuary 1 – May 7 (127 days)
Expected harvestFebruary 14 – May 7

How these dates are judged

Ideal conditions
Daytime air from 59 – 81 °F.
Suitable conditions
Daytime air from 39 – 86 °F.
Last frost and first frost
Typical spring and fall frost dates for San Antonio, shown in the key dates.
Days to harvest
22–35 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 Radish: Jan 1 – May 7; Oct 28 – Jan 18 (210 days)

Planting window for Radish: Jan 23 – Apr 5; Oct 28 – Nov 29 (106 days)

Outdoors: weekly temperatures and windows

Temperatures across the year for San Antonio. 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 15–27 °CIdeal 59–81 °FWindowGrowingJan 1 – May 7; Oct 28 – Jan 18PlantingJan 23 – Apr 5; Oct 28 – Nov 29No 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 46 to 65 °F · Possible 31 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 86 °F; it is suitable when that average range also overlaps the ideal 59 to 81 °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 San Antonio

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 29.42, -98.49, 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 Radish 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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