When to plant sweet potato in San Antonio

In San Antonio, typical last spring frost is January 30 and typical first fall frost is December 24. Typical last spring frost: January 30. Sweet potato in San Antonio is doable with planning outdoors. 125 suitable days are enough for fast varieties (85 days) but not slow ones (140 days).

Sweet potato

How to grow Sweet potato San Antonio climate Weekly temperatures and windows

Where are you growing?

Tight fit

Tight fit in greenhouse

Comfortable in a cold frame

Sweet potato in San Antonio is doable with planning outdoors. 125 suitable days are enough for fast varieties (85 days) but not slow ones (140 days).

When to plantMarch 20 – May 14

Harvest: June 13 – October 1
Season vs crop: 125 grow days vs 85–140 needed
Typical frost (last spring – first fall): January 30 – December 24

Sweet potato in San Antonio is doable with planning outdoors. 125 suitable days are enough for fast varieties (85 days) but not slow ones (140 days).

Start slips February 6 – April 2, then transplant March 20 – May 14 so the crop can finish outdoors.

Planting conditions

Suitable growing days in a row125

Days to harvest85–140 days from planting

No planting window is recorded for this place.

Too cold
Frost line

Blue fill is usually too cold for this plant. Dashed lines are typical last and first frost (35 seasons (1991–2025)). 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 (21 – 32 °C70 – 90 °F21 – 32 °C (70 – 90 °F)) and tolerable (16 – 35 °C61 – 95 °F16 – 35 °C (61 – 95 °F)) ranges.

Ideal / plantable
Tolerable
Too cold
Too hot
Outside window

Planting uses sow / plant-out rules; growing shows daytime air against this plant’s ideal and tolerable ranges.

Key dates

Typical last spring frostJanuary 30

Low-risk last spring frostMarch 6

Typical first fall frostDecember 24

Low-risk first fall frostDecember 4

Frost-free days327

Earliest indoor seed startFebruary 6

Latest indoor seed startApril 2

Transplant outdoorsMarch 20 – May 14

Direct sow windownot recommended here

Suitable growing windowMarch 20 – July 22 (125 days)

Expected harvestJune 13 – October 1

How these dates are judged

Ideal conditions: Daytime air from 21 – 32 °C70 – 90 °F21 – 32 °C (70 – 90 °F).
Suitable conditions: Daytime air from 16 – 35 °C61 – 95 °F16 – 35 °C (61 – 95 °F).
Last frost and first frost: Typical spring and fall frost dates for San Antonio, shown in the key dates.
Days to harvest: 85–140 days from planting, 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. Air ratings on the weekly chart colour only weeks inside that same window — see weekly temperatures and windows.

Other plants for San Antonio

Calculated by Plan & Plant. Method. Data 35 seasons (1991–2025).

Frost and suitability dates are typical figures from climate statistics.

Based on 35 years (1991–2025) of ERA5-Land data from Open-Meteo, for an area of about 10 km. Typical dates, not a guarantee.

Dates for San Antonio use ERA5-Land cell 29.42, -98.49. How we calculated this · Algorithm 2026-10-season-10.

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