From: Growing Vegetables west of the cascades by Steve Solomon, 5th edition.
February

• Entire month - Transplant asparagus roots
• 15th - Sow peas, favas, spinach

March

• Entire month - Sow peas, favas, spinach, asparagus seed, mustard and related Asian greens radishes, parsley, bulb onions, scallions
• 15th - Transplant earliest broccoli and cabbage seedlìngs
• 17th - St. Patrick's Day ritual - sow potatoes

April

• Entire month - Snow peas, scallions, spinach (summer varieties), beets, turnips, radishes kohlrabi, chard, carrots, lettuce, broccoli, cabbage, parsley, sorrel, cauliflower, potatoes
• 1st - Transplant earliest cauliflower
• after 15th - Transplant onion seedlings and early leeks. Sow celery and celeriac

May

• Entire month - Sow cauliflower, cabbage, beets, radishes, chard, carrots, lettuce, broccoli winter leek nursery bed, scallion, potatoes, lettuce
• 15th - Sow snap beans, squash (summer and winter), basil, dill, dry beans, sweet corn. Transplant tomato, celery, and celeriac seedIings

June

• Entire month - Sow cucumbers, summer squash, melons, snap beans, beets, carrots, lettuce broccoli, fall and winter cabbage, Brussels sprouts, cauliflower, scallions
• 15th - Transplant peppers and eggplant

July

• Entire month - Sow lettuce. Transplant winter leeks
• before 15th - Sow parsnips, carrots, summer beets, fall cauliflower, bush snap beans, scallions
• after 15th - Sow rutabaga, kale, winter beets, spinach, overwintering broccoli

August

• Entire month - Sow endive, spinach
• before 15th - Sow overwintering cauliflower, loose-leaf lettuce
• after 15th - Sow overwintering bulb onions

September

• before 15th - Sow endive, corn salad, garlic and shallots, field turnips (as green manure)

October

• Entire month - Sow green manures: favas, crimson clover, field peas