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ZIP 78205 planting calendar

When to plant cucumbers in San Antonio, TX - Zone 9a

In ZIP 78205, plant cucumbers around Mar 11; this uses the San Antonio frost station, USDA zone 9a, and cucumbers timing rules.

Your San Antonio calendar has a 264-day estimated frost-free season. This estimate uses the representative San Antonio frost station, USDA zone 9a, and cucumbers timing rules.

Source: san-antonio-intl frost station, USDA zone 9a, last updated 2026-06-28. Verify locally before planting high-value crops because microclimates, current weather, and yard exposure can move the safe date.

Reviewed by GrowZone Editorial. Calculated from the san-antonio-intl frost station and USDA zone 9a, last updated 2026-06-28.

In the San Antonio area, cucumbers timing follows the San Antonio frost window, so the local ZIP date can differ from a broad zone-only calendar.

USDA zone 9a San Antonio frost station Texas A&M AgriLife Extension Updated 2026-06-28
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Answer first

When to start cucumbers seeds indoors in San Antonio

In ZIP 78205, start cucumbers seeds indoors around Feb 8, about 21 days before the Mar 1 last-frost estimate.

Start cucumbers seeds indoors in San Antonio around Feb 8, about 21 days before the Mar 1 last-frost estimate.

Seed starting schedule

Cucumbers dates for San Antonio, TX

StepDateHow to use it
Start IndoorsFebruary 8, 2026Start seeds under lights or in a bright indoor seed-starting space.
Transplant OutdoorsMarch 11, 2026Move hardened-off seedlings outside after the frost-risk window.
Direct SowMarch 11, 2026Sow seed outside when the crop and soil can handle the window.

Last frost

When is the last frost in San Antonio?

San Antonio (ZIP 78205) has an average last spring frost around Mar 1.

First frost

When is the first frost in San Antonio?

The average first fall frost is around Nov 20, giving about 264 frost-free days.

Season map

Cucumbers windows by month

JanFebMarAprMayJunJulAugSepOctNovDec
Start indoors
Feb 8
Direct sow
Mar 11
Transplant
Mar 11
Harvest
May 10
Frost watch
Sep 21

Reminder workflow

Every date has a next action

Start cucumbers indoorsFeb 8
Last frost windowMar 1
Direct sow cucumbersMar 11
Transplant cucumbersMar 11
First cucumbers harvest windowMay 10
Last cucumbers sowing targetSep 21
SignalValueWhy it matters
Last frost estimateMarch 1, 2026Warm-season transplant risk starts falling after this window.
First frost estimateNovember 20, 2026Fall planting counts backward from this date.
Season length264 daysLonger seasons can support succession crops.
Spacing12-18 inAirflow and root space affect yield.
Soil temperature65 F+Seeds and transplants stall in cold soil.

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Local data

Why this date changes by ZIP

San Antonio frost history and USDA zone 9a shift the safe planting window. GrowZone uses a local representative station instead of one national rule.

Texas A&M AgriLife Extension is the kind of local source to verify against when a crop is expensive, weather is unusual, or your yard has a cold pocket.

Crop note

Cucumbers timing notes

Use a trellis if space is tight and keep soil evenly moist. Cucumbers prefers full sun, 12-18 in spacing, and soil near 65 F+.

For fall, count backward from Nov 20. A conservative last sowing target is around Sep 21.