What to plant in March in Oklahoma

Last chance in March

Basil (start seeds indoors, by Mar 4) · Collard Greens (start seeds indoors, by Mar 4) · Endive & Escarole (start seeds indoors, by Mar 4) · Kohlrabi (start seeds indoors, by Mar 4) · Malabar Spinach (start seeds indoors, by Mar 4) · Okra (start seeds indoors, by Mar 4) · Radicchio (start seeds indoors, by Mar 4) · Summer Savory (start seeds indoors, by Mar 4) · Bitter Melon (start seeds indoors, by Mar 11) · Bok Choy / Pak Choi (start seeds indoors, by Mar 11) · Cucamelon (start seeds indoors, by Mar 11) · Fennel (Bulb) (start seeds indoors, by Mar 11) · Lettuce (start seeds indoors, by Mar 11) · Luffa (Loofah Gourd) (start seeds indoors, by Mar 11) · Napa Cabbage (start seeds indoors, by Mar 11) · New Zealand Spinach (start seeds indoors, by Mar 11) · Peanut (start seeds indoors, by Mar 11) · Swiss Chard (start seeds indoors, by Mar 11) · Watercress (start seeds indoors, by Mar 11) · Mache (Corn Salad) (direct sow (spring), by Mar 11) · Pea (direct sow (spring), by Mar 11) · Spinach (direct sow (spring), by Mar 11) · Green Onion / Scallion (transplant outdoors, by Mar 14) · Arugula (direct sow (spring), by Mar 18) · Beet (direct sow (spring), by Mar 18) · Fava Bean (Broad Bean) (direct sow (spring), by Mar 18) · Green Onion / Scallion (direct sow (spring), by Mar 18) · Mizuna (direct sow (spring), by Mar 18) · Onion (direct sow (spring), by Mar 18) · Radish (direct sow (spring), by Mar 18) · Shallot (direct sow (spring), by Mar 18) · Tatsoi (direct sow (spring), by Mar 18)

Sow or plant outdoors in March (72)

Direct sowing and transplanting windows that fall in March, most urgent first. Windows are one-to-two-week bands around the ideal date.

Start seeds indoors in March (26)

Indoor sowings for transplants later. Six to eight weeks under lights is typical for tomatoes and peppers; onions and leeks need longer.

Harvesting in March

First harvests expected this month from crops sown or planted on time earlier in the season.

Planting dates for popular crops in Oklahoma

Every crop has its own full-year dates for Oklahoma: indoor start, transplant or direct sowing, and harvest.

Last-frost month: March garden jobs in Oklahoma

1. The average last frost is April 1. Hardy crops can go out now - mache (corn salad), pea, spinach, green onion / scallion - but hold tender ones like tomatoes, peppers and squash until after that date.
2. Start hardening off indoor seedlings 7-10 days before they go out: a few hours of outdoor shade first, building up to full sun and nights outside.
3. Keep row cover or old sheets handy and watch the 10-day forecast - a clear, still night after a warm spell is the classic late-frost setup.
4. Soil temperature matters as much as the calendar: most warm-season seed rots below about 60°F. Check the frost dates guide for how the Oklahoma average is worked out.

USDA zone chart for Oklahoma

Oklahoma spans USDA zones 6b, 7a, 7b, 8a. Colder zones, usually higher or further inland, have a later last spring frost and an earlier first fall frost than the state average.

Questions gardeners ask