Mid-Summer (third season) Vegetable Planting

The third season of vegetable planting begins soon. Check the chart for plants that can be seeded now and through August into early September.

There is plenty of time to seed many different crops that will mature in about sixty days. This is based on a mid-October hard freeze.

Tuck in the seeds wherever there is room. Later in August and September you can seed lettuce, spinach, arugula and radishes-the quicker maturing cool-season crops. 

Cool-season vegetables and herbs that can be seeded right now include beets, Brussels sprouts, cabbage, cauliflower, cilantro, Swiss chard, collards, bunching onions, parsley, peas.

Warm-season vegetables and herbs that can be seeded right now include basil, bush beans, slicing cucumber, okra, New Zealand spinach, summer squash.

Fall or Third Season Planting Calendar for the Colorado Front Range

Use of cold frames or tunnels may help extend the season

CROP – COOL SEASON	DAYS TO MATURITY	FALL SEED Based on Mid-Oct. Freeze
Arugula	30	Mid-August
Asparagus	Perennial	Early Spring Plant
Beets	60-65	Mid-July
Broccoli	70	Mid/End-July
Brussels Sprouts	80-95	Mid-July
Cabbage	60-70	Mid-July
Carrots	55-75	End July
Cauliflower	50-55	Mid-July
Cilantro	55-65	Mid-July
Chard-Swiss	50	Mid-July
Celery	85-110	Spring Plant
Chinese (Napa) Cabbage	48-55	End July
Chives Onion	Perennial	Spring-Fall Plant
Chives Garlic	Perennial	Spring-Fall Plant
Collards	50-55	Mid-July
Garlic		Mid-Sept Mid-Oct
Horseradish	Perennial	Spring-Fall Plant
Kale, Mustard Greens	50-55	Early August
Kohlrabi	55	Mid- August
Lettuce Leaf	40-45	Mid-August
Lettuce Head	70-80	Early August
Onion Bulb	100	Spring Plant
Onion Bunching	60-80	Mid-July
Parsley	75	Mid-July
Parsnips	85-120
Peas – shell and snap	50-65	Mid-July
Peas Edible Podded-snow	60	Mid-July
Potato Tubers	80-120	Spring Plant
“New” Potatoes	50-60 days	Spring Plant
Radishes	20-30	Early Sept.
Rhubarb	Perennial	Spring-Fall Plant
Rutabaga	90-95	Early August
Shallots	110	Early Sept. Zone 5 or warmer
Spinach	30-50	Mid-August
Turnip	40-75	End July
CROP – WARM SEASON	DAYS TO MATURITY	FALL SEED Based on Mid-Oct. Freeze
Basil	60-85	Mid-July
Beans, Bush	45-50	Mid-July
Beans, Pole	60-65	June-July
Corn, Sweet	65-80	Spring Plant
Cucumber Slicing	48-72	Mid-July
Cucumber Pickling	48-58	Mid-July
Eggplant	60-80	Spring Plant
Cantaloupe	85-120	Spring Plant
Okra	55-65	Mid-July
New Zealand Spinach	50-60	Mid-July
Pepper	70-80	Spring Plant
Pumpkin	95-110	Spring Plant
Squash Summer	55-65	Mid-July
Squash Winter	55-105	Spring Plant
Tomato	60-85	Spring Plant
Tomatillos	75-100	Spring Plant
Watermelon	75-100	Spring Plant