What should I plant in September in Zone 5A?

In September in Zone 5A, you can start 0 crops indoors and plant 0 crops outside. The last frost in Zone 5A averages April 30, so planting schedules are timed around that date.

What can I harvest in September in Zone 5A?

6 crops are entering their harvest window in September in Zone 5A. Exact harvest timing depends on when crops were planted and current growing conditions.

Zone 5A — September

What to Plant in September in Zone 5A

September in Zone 5A: 0 crops to start indoors, 0 to plant or direct sow outside, and 6 entering harvest window. Last frost averages April 30. Reference city: Des Moines, IA.

Updated May 14, 2026 · Frost data from NOAA 1991-2020 Climate Normals

0 Start Indoors

0 Plant Outside

6 Harvest

Start Indoors in September

No crops to start indoors in September for Zone 5A.

Plant Outside in September

No crops to plant outside in September for Zone 5A.

Harvest in September

Plant	Type	Planted / Sown	Harvest Window
Horseradish	vegetable	Apr 30	Sep 17 – Oct 7
Atlantic Giant Pumpkin	squash	May 7	Sep 4
Cardoon (Purple Artichoke Thistle)	vegetable	May 7	Sep 4 – Nov 3
Chayote squash	vegetable	May 14	Sep 11 – Oct 11
Jerusalem artichoke tubers	root_vegetable	May 14	Sep 1 – Oct 11
Tepin Hot Peppers	pepper	May 14	Sep 11 – Nov 30

Key Tasks for September in Zone 5A

1 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.

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