Our garden calendar

ROCKY MOUNTAIN STATES
Planting and harvest dates vary according to location. A good rule of thumb is to sow warm-season vegetables (chiles, corn, cucumbers, edamame, melons, squash, tomatoes, zucchini) indoors from seed about six weeks before average date of last frost, and plant seedlings outside only after average date of last frost. 

Your local county agricultural extension office can give you dates specific to your area, as can most local nurseries.

September
Harvest all warm-season crops (corn, cucumbers, melons, squash, zucchini)
Note: Pick everything that is ready before killing frost is expected; for light frost, protect chiles and tomatoes with floating row covers.

October
Harvest & press wine grapes
Plant:
• Barley
• Garlic
• Wheat

March
Enrich soil:
• Add compost & fertilizer

Plant:
• Chives
• Onions (sets)
• Potatoes
• Sow warm-season crops (such as basil, chiles, cucumbers, edamame, melons, squash, tomatoes, zucchini) indoors for transplant out after average date of last spring frost

April
Plant:
• Hop vines
• Oregano
• Peppermint
• Potatoes
• Hardy rosemary ('Arp' is the most cold-tolerant; it overwinters if temps don't go below -10°)

May
Plant, after danger of frost is past:
• Basil (seedlings; through Jun)
• Chiles (seedlings; through Jun)
• Corn (from seed)
• Cucumbers (seedlings; through Jun)
• Edamame (seed; mid-May through early Jun)
• Lemongrass (seed)
• Marjoram (through Jun)
• Melons (seedlings; through Jun)
• Squash (seedlings; through)
• Tomatoes (seedlings; through Jun)
• Zucchini (seedlings; through Jun)

June
Plant:
• Eureka lemon in container (bring inside during winter)
• Lemongrass (divisions)

July
Harvest:
• Garlic
• Herbs
• Potatoes

August
Harvest:
• Early warm-season crops (beans, cucumbers, early tomatoes)
• Barley (early Aug)
• Hops (late Aug through early Sep)

WESTERN OREGON, WESTERN WASHINGTON, AND SOUTHWESTERN BRITISH COLUMBIA

September
Harvest all crops

Plant:
• Garlic
• Winter wheat (through early Oct)

October
Harvest & press wine grapes

November
Harvest & press olives for oil

February
Enrich soil:
• Till cover crops into soil
• Add compost
• Add organic fertilizer

March
Plant:
• Chives
• Onions (sets)
• Potatoes (through Apr)
• Sow seed of warm-season crops (basil, chiles, cucumbers, melons, squash, tomatoes, zucchini) indoors for transplant out in late May

April
Plant:
• Hop vines
• Herbs (hardy Italian marjoram, oregano, peppermint, rosemary, thyme)

MAY
Plant:
• Basil (seedlings, plus seed every three weeks through mid-Jul)
• Chiles (seedlings; through Jun)
• Corn (from seed)
• Cucumbers (seedlings; through Jun)
• Edamame (from seed; through Jun)
• Lemongrass (seed)
• Marjoram (tender annual sweet marjoram; through Jun)
• Melons (seedlings; through Jun)
• Squash (seedlings; through Jun)
• Tomatoes (seedlings; through Jun)
• Zucchini (seedlings; through Jun)

June
Plant: 
• Eureka lemon in container (bring inside during winter)
• Squash (summer and winter)
• Tomatoes (seedlings)

Harvest onions & let cure

July
Harvest:
• Garlic and let cure
• Herbs
• Potatoes

August
Harvest:
• Herbs
• Early warm-season crops (cucumbers, edamame, early tomatoes)