Maximizing Your Growing Season: Climate Calculations and Season Extenders

Understanding Your Growing Season

Before finalizing vegetable choices, calculate your growing season length by counting days between the average last spring frost and first fall frost (available from your Cooperative Extension Office or local nursery). Last-frost dates indicate when to safely plant tender crops; first-frost dates signal when protection is needed late in the season. Choose varieties that mature within this window—if a winter squash needs 120 days but your season is 100 days, select a short-season variety or use season-extending techniques.

Season Extenders

Warm-season vegetables often need frost protection in spring and fall. Individual plants can be shielded with plastic or paper hotcaps; special water-filled cylinders work well for tomatoes.

Floating row covers (polyethylene, polyester, or polypropylene) are among the most versatile tools. These lightweight fabrics transmit 80-95% of sunlight, allow water and air passage, and protect from cold and certain insects. Lay them directly over beds or prop on stakes. Bury edges to seal out pests, but remove covers when plants bloom to admit pollinators.