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Zone 3A — March

What to Plant in March in Zone 3A

March in Zone 3A: 17 crops to start indoors, 0 to plant or direct sow outside, and 0 entering harvest window. Last frost averages May 22. Reference city: Tower, MN.
Updated August 12, 2026 · Frost data from NOAA 1991-2020 Climate Normals
17 Start Indoors
0 Plant Outside
0 Harvest
Frost risk: High

Frost risk is still high in Zone 3A. The last spring frost typically lands on May 22, with the earliest plausible clearance around May 8. Hold tender crops indoors a while longer.

See full Zone 3A frost outlook

Start Indoors in March

Plant Type Start Indoors Transplant Outside Harvest Window
Alexandria Alpine Strawberry berry Mar 13 May 29 Perennial — see plant page
Angelica herb Mar 20 May 22 Aug 10 – Aug 20
Charleston Wakefield Cabbage brassica Mar 27 May 1 Jul 10
Early Jersey Wakefield Cabbage brassica Mar 27 May 1 Jul 5 – Jul 15
Giant Maximum Mix Snapdragon Flowers flower Mar 20 May 22 Aug 10 – Aug 25
Michihili Cabbage brassica Mar 27 May 1 Jul 10
Ox-Eye Daisy Flowers flower Mar 20 May 22 Perennial — see plant page
Red Acre Cabbage brassica Mar 27 May 1 Jul 15 – Jul 20
Shasta Daisy Flowers flower Mar 20 May 22 Perennial — see plant page
Southport Red Globe Onions allium Mar 20 May 22 Sep 19
Southport White Globe Onions allium Mar 20 May 22 Sep 19
Spanish Sweet White Onions allium Mar 20 May 22 Sep 9 – Sep 19
Victoria Rhubarb vegetable Mar 20 May 8 Perennial — see plant page
Big Jim Hatch Chile pepper Mar 27 Jun 5 Aug 14 – Aug 19
Cherry Bomb peppers pepper Mar 20 Jun 5 Aug 19 – Aug 24
Corno di Toro Pepper pepper Mar 27 Jun 5 Aug 19 – Aug 24
Hungarian Hot Wax Pepper pepper Mar 27 Jun 5 Aug 9 – Aug 19

Plant Outside in March

Nothing to plant or sow outside in March for Zone 3A.
Next window: April — 5 varieties, including Candy Onion, Dutch Yellow Shallots, French Red Shallots.

Harvest in March

Nothing to harvest in March for Zone 3A.
Next window: May — 2 varieties, including Black Oil Sunflower Microgreens, Speckled Pea Shoot Microgreens.

Key Tasks for March in Zone 3A

  1. 1 Start 17 varieties indoors this month under grow lights or in a sunny south-facing window. Use a seed-starting mix and bottom heat (70–75°F) for best germination rates.
  2. 2 Check soil moisture before watering — stick a finger 2 inches into the soil. Water only when the soil is dry at that depth. Consistent moisture is more important than frequency.
Back to full Zone 3A planting calendar
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