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Zone 9A — September

What to Plant in September in Zone 9A

September in Zone 9A: 0 crops to start indoors, 2 to plant or direct sow outside, and 25 entering harvest window. Last frost averages March 4. Reference city: Austin, TX.
Updated May 13, 2026 · Frost data from NOAA 1991-2020 Climate Normals
0 Start Indoors
2 Plant Outside
25 Harvest
Frost risk: High

Frost risk is still high in Zone 9A. The last spring frost typically lands on March 4, with the earliest plausible clearance around February 5. Hold tender crops indoors a while longer.

See full Zone 9A frost outlook

Start Indoors in September

Nothing to start seeds indoors in September for Zone 9A.
Next window: December — 12 varieties, including Brilliant Celeriac, Carolina Reaper peppers, Cherry Bomb peppers.

Plant Outside in September

Plant Type Action Target Date Harvest Window
Nantes Carrot (fall planting) root vegetable Direct Sow Sep 3 Nov 17
Sugar Snap Pea (fall planting) legume Direct Sow Sep 17 Nov 26

Harvest in September

Plant Type Planted / Sown Harvest Window
Carmen Peppers (fall planting) pepper Aug 1 Sep 30 – Oct 20
Early Girl Tomatoes (fall planting) tomato Aug 1 Sep 22 – Oct 2
Gardener's Delight Tomatoes (fall planting) tomato Aug 1 Sep 30 – Oct 15
Glacier Tomatoes (fall planting) tomato Aug 1 Sep 25 – Sep 28
Green Envy Tomatoes (fall planting) tomato Aug 1 Sep 30 – Oct 10
Gypsy Peppers (fall planting) pepper Aug 1 Sep 30 – Oct 5
Honey Bee Tomatoes (fall planting) tomato Aug 1 Sep 30
Juliet Tomatoes (fall planting) tomato Aug 1 Sep 29 – Oct 1
King Arthur Peppers (fall planting) pepper Aug 1 Sep 29
Lunchbox Mini Peppers (fall planting) pepper Aug 1 Sep 25 – Sep 30
Matt's Wild Cherry Tomatoes (fall planting) tomato Aug 1 Sep 25 – Oct 5
Oregon Spring Tomatoes (fall planting) tomato Aug 1 Sep 28 – Oct 10
Padron Peppers (fall planting) pepper Aug 1 Sep 30
Red Robin Tomatoes (fall planting) tomato Aug 1 Sep 25
Sakura Tomatoes (fall planting) tomato Aug 1 Sep 25 – Sep 30
Shishito Peppers (fall planting) pepper Aug 1 Sep 30 – Oct 5
Stupice Tomatoes (fall planting) tomato Aug 1 Sep 25 – Oct 10
Sun Gold Tomatoes (fall planting) tomato Aug 1 Sep 27 – Oct 5
SunChocola Tomatoes (fall planting) tomato Aug 1 Sep 30 – Oct 10
Sungella Tomatoes (fall planting) tomato Aug 1 Sep 30 – Oct 10
Sweet 100 Tomatoes (fall planting) tomato Aug 1 Sep 30 – Oct 5
Sweet Million Tomatoes (fall planting) tomato Aug 1 Sep 30 – Oct 5
Tigerella Tomatoes (fall planting) tomato Aug 1 Sep 25 – Oct 10
Tiny Tim Tomatoes (fall planting) tomato Aug 1 Sep 15 – Sep 25
White Cherry Tomatoes (fall planting) tomato Aug 1 Sep 29 – Oct 10

Key Tasks for September in Zone 9A

  1. 1 Direct sow seeds at the recommended depth and spacing. Keep the seedbed consistently moist until germination is complete.
  2. 2 Apply 2–3 inches of mulch around heat-sensitive crops to retain moisture and keep root zones cooler. Water deeply and less frequently rather than shallow daily watering.
  3. 3 Check soil moisture before watering — stick a finger 2 inches into the soil. Water only when the soil is dry at that depth. Consistent moisture is more important than frequency.
Back to full Zone 9A planting calendar
August September in Zone 9A October

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