When to plant Summer squash (zucchini)

The planting dates depend on your average frost dates. Enter a ZIP code to get yours, or read the USDA table below.

Earliest safe spring planting dates: summer squash
Average last freezePlant
Jan 30Feb 1 – Apr 15
Feb 8Feb 15 – Apr 15
Feb 18Mar 1 – Apr 15
Feb 28Mar 15 – May 15
Mar 10Mar 15 – May 1
Mar 20Apr 1 – May 15
Mar 30Apr 10 – June 1
Apr 10Apr 20 – June 1
Apr 20May 1 – June 15
Apr 30May 1 – 30
May 10May 10 – June 10
May 20May 20 – June 15
May 30June 1 – 20
June 10June 10 – 20
Latest safe fall planting dates: summer squash
Average first freezePlant by
Aug 30June 10 – 20
Sept 10June 1 – 20
Sept 20May 15 – July 1
Sept 30June 1 – July 1
Oct 10June 1 – July 15
Oct 20June 1 – July 20
Oct 30June 1 – Aug 1
Nov 10June 1 – Aug 10
Nov 20June 1 – Aug 20
Nov 30June 1 – Sept 1
Dec 10June 1 – Sept 15
Dec 20June 1 – Oct 1

Source: USDA Home and Garden Bulletin No. 9 (1967), “Suburban and Farm Vegetable Gardens,” tables 4 and 5. The bulletin scan.

Summer Squash (Zucchini) by state