How to extend the zucchini harvest season?

To achieve extra zucchini harvests, seasonal manipulation techniques will be necessary to extend production beyond the normal harvest season. Succession planting and protection from the elements will yield an additional 6-8 weeks of harvest. With the solution of early frosts, I harvest fresh zucchini in my Zone 5 garden until Thanksgiving using these techniques.

Implement succession planting beginning with your first spring crop. Every three weeks (until midsummer), seed new plants in soil warmed to above 60°F (15°C). This will provide overlapping crops with continuous possibilities for harvest, as well as staggered plantings that yield 20 pounds weekly from July through October.

Choose varieties that endure mild cold and were developed for extended cold weather. 'Tromboncino' endures occasional dipping to 34°F (1°C), while 'Costata Romanesco' withstands temperature fluctuations better than ordinary types. Mix these with powdery mildew-resistant sorts such as 'Dunja' for continued production into winter.

Place row cover protection over plants at night when nighttime temperatures are in the 50s (10s °C). Use floating row covers and secure them with landscape staples, but use covers that allow 85% light penetration. Change to plastic tunnels when frost threatens. Add thermal mass to the area using water jugs. Remove covers during the daytime when temperatures are above 60°F (15 °C) to promote pollination.

Alter your local environment as seasons change. Plant beside south-facing walls that reflect heat stored during cool nights. A six-inch trench may be dug around your bed to retain warm air in this way. These methods yielded 18 productive days during my last harvest.

Read the full article: When to Plant Zucchini for a Bountiful Harvest