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Zone 3B — April

What to Plant in April in Zone 3B

April in Zone 3B: 97 crops to start indoors, 26 to plant or direct sow outside, and 0 entering harvest window. Last frost averages May 18. Reference city: International Falls, MN.
Updated August 12, 2026 · Frost data from NOAA 1991-2020 Climate Normals
97 Start Indoors
26 Plant Outside
0 Harvest
Frost risk: High

Frost risk is still high in Zone 3B. The last spring frost typically lands on May 18, with the earliest plausible clearance around May 5. Hold tender crops indoors a while longer.

See full Zone 3B frost outlook →

Start Indoors in April

Plant Type Start Indoors Transplant Outside Harvest Window
Alaska Early Pea legume Apr 20 Apr 27 Jun 21 – Jun 26
Broad Windsor Fava Bean legume Apr 20 Apr 27 Jul 11 – Jul 21
Cascadia Sugar Snap Pea legume Apr 20 Apr 27 Jul 1 – Jul 3
Charleston Wakefield Cabbage brassica Apr 13 Apr 27 Jul 11
Chervil herb Apr 20 Apr 27 Jun 1 – Jun 11
Crimson Cherry Rhubarb Root vegetable Apr 13 Apr 20 Perennial — see plant page
Dandelion herb Apr 20 Apr 27 Perennial — see plant page
Delicatesse Blue Kohlrabi brassica Apr 20 Apr 27 Jun 21 – Jun 26
Delicatesse White Kohlrabi brassica Apr 20 Apr 27 Jun 21 – Jun 26
Dutch Yellow Shallots allium Apr 13 Apr 20 Jul 19 – Aug 18
Early Jersey Wakefield Cabbage brassica Apr 13 Apr 27 Jul 1 – Jul 11
French Red Shallots allium Apr 13 Apr 20 Jul 19 – Aug 18
Green Arrow Pea legume Apr 20 Apr 27 Jul 1 – Jul 6
Hard Red Wheat Cover Crop cover crop Apr 20 Apr 27 Jul 11 – Jul 31
Holland Red Shallots allium Apr 13 Apr 20 Jul 19 – Aug 18
Little Marvel Pea legume Apr 20 Apr 27 Jun 26 – Jun 29
Mammoth Melting Sugar Snow Pea legume Apr 20 Apr 27 Jul 4 – Jul 10
Michihili Cabbage brassica Apr 13 Apr 27 Jul 6
Oregon Giant Snow Pea legume Apr 20 Apr 27 Jul 6 – Jul 10
Oregon Sugar Pod Snow Pea legume Apr 20 Apr 27 Jun 26 – Jul 4
Progress No. 9 Shelling Pea legume Apr 20 Apr 27 Jun 24 – Jun 28
Red Acre Cabbage brassica Apr 13 Apr 27 Jul 11 – Jul 16
Sugar Ann Snap Pea legume Apr 20 Apr 27 Jun 18 – Jun 22
Vienna Purple Kohlrabi brassica Apr 20 Apr 27 Jun 21 – Jul 1
Vienna White Kohlrabi brassica Apr 20 Apr 27 Jul 1
Wando Pea legume Apr 20 Apr 27 Jun 29 – Jul 4
Alexandria Alpine Strawberry berry Apr 13 May 25 Perennial — see plant page
All Season Cabbage brassica Apr 20 May 4 Jul 13 – Jul 23
All Year Round Cauliflower brassica Apr 20 May 4 Jul 8
Angelica herb Apr 20 May 18 Aug 6 – Aug 16
Blue Flax Flowers flower Apr 27 May 4 Perennial — see plant page
Bouquet Dill herb Apr 27 May 4 Jun 23 – Jul 8
Brunswick Cabbage brassica Apr 20 May 4 Jul 23 – Aug 2
Calabrese Broccoli brassica Apr 20 May 4 Jul 8
Carentan Leeks allium Apr 13 May 4 Aug 2 – Aug 22
Catmint herb Apr 27 May 18 Perennial — see plant page
Chinese Forget-Me-Not Flowers flower Apr 27 May 4 Jul 8 – Jul 28
Copenhagen Cabbage brassica Apr 20 May 4 Jul 8
Crackerjack Mix Marigolds flower Apr 27 May 18 Jul 17 – Aug 1
Danish Ballhead Cabbage brassica Apr 20 May 4 Aug 12 – Aug 22
Di Cicco Broccoli brassica Apr 20 May 4 Jul 8
Drumhead Cabbage brassica Apr 20 May 4 Aug 2 – Aug 12
Dukat Dill herb Apr 27 May 4 Jun 13 – Jun 23
Early Purple Broccoli brassica Apr 20 May 4 Jul 8
Evergreen Parsley herb Apr 27 May 4 Jul 13 – Jul 28
Fenugreek herb Apr 27 May 4 Jun 8 – Jun 23
Giant Maximum Mix Snapdragon Flowers flower Apr 20 May 18 Aug 6 – Aug 21
Giant Musselburgh Leeks allium Apr 13 May 4 Aug 12 – Aug 17
Glory of Enkhuizen Cabbage brassica Apr 20 May 4 Aug 2
Golden Acre Cabbage brassica Apr 20 May 4 Jul 8
Hamburg Rooted Parsley herb Apr 27 May 4 Aug 2 – Aug 22
Igloo Cauliflower brassica Apr 20 May 4 Jul 8 – Jul 13
Imperial Star Artichoke vegetable Apr 13 May 18 Aug 16 – Aug 26
Isis Candy Cherry Tomatoes tomato Apr 27 May 25 Aug 3 – Aug 13
Kellogg's Breakfast tomatoes tomato Apr 27 May 25 Aug 8 – Aug 18
Mammoth Dill herb Apr 27 May 4 Jun 18 – Jul 8
Mary Washington Asparagus vegetable Apr 27 May 4 Perennial — see plant page
Matt's Wild Cherry Tomatoes tomato Apr 27 May 25 Jul 19 – Jul 29
Medium Red Clover Cover Crop cover crop Apr 27 May 4 Jul 3 – Jul 18
Millennium Asparagus vegetable Apr 27 May 4 Perennial — see plant page
Mrs. Burns Lemon Basil herb Apr 27 May 25 Jul 24 – Aug 3
OG American Flag Leeks allium Apr 13 May 4 Aug 2 – Aug 12
Ox-Eye Daisy Flowers flower Apr 20 May 18 Perennial — see plant page
Paul Robeson tomatoes tomato Apr 27 May 25 Aug 3 – Aug 18
Purple Passion Asparagus vegetable Apr 27 May 4 Perennial — see plant page
Rapeseed Cover Crop cover crop Apr 27 May 4 Jun 18 – Jul 13
Rapini Broccoli Raab brassica Apr 27 May 4 Jul 8
Savoy Perfection Cabbage brassica Apr 20 May 4 Aug 2 – Aug 7
Scarlet Flax Flowers flower Apr 27 May 4 Jun 28 – Jul 13
Shasta Daisy Flowers flower Apr 13 May 18 Perennial — see plant page
Shungiku (Edible Chrysanthemum) lettuce Apr 27 May 4 Jun 13 – Jun 28
Snowball Self-Blanche Cauliflower brassica Apr 20 May 4 Jul 8
Sparky Mix Marigolds flower Apr 27 May 18 Jul 12 – Jul 27
Sweet Marjoram herb Apr 27 May 25 Aug 8 – Aug 23
Sweet Woodruff herb Apr 27 May 18 Perennial — see plant page
Tansy herb Apr 27 May 18 Perennial — see plant page
Victoria Rhubarb vegetable Apr 13 May 4 Perennial — see plant page
Violetta Purple Cauliflower brassica Apr 20 May 4 Jul 8
Wormwood herb Apr 27 May 18 Perennial — see plant page
Aji Dulce Peppers pepper Apr 27 Jun 1 Aug 30 – Sep 19
Anaheim Peppers pepper Apr 27 Jun 1 Aug 17 – Aug 25
Big Jim Hatch Chile pepper Apr 27 Jun 1 Aug 10 – Aug 15
Cayenne Peppers pepper Apr 27 Jun 1 Aug 25 – Sep 4
Cherry Bomb peppers pepper Apr 20 Jun 1 Aug 15 – Aug 20
Chinese 5-Color Peppers pepper Apr 27 Jun 1 Aug 15 – Aug 25
Corno di Toro Pepper pepper Apr 27 Jun 1 Aug 15 – Aug 20
Datil peppers pepper Apr 20 Jun 1 Aug 30 – Sep 19
Fish Peppers pepper Apr 27 Jun 1 Aug 10 – Aug 20
Fresno Peppers pepper Apr 27 Jun 1 Aug 15 – Aug 20
Gochugaru Korean Peppers pepper Apr 27 Jun 1 Aug 15
Hatch Green Chile (NM 6-4) Peppers pepper Apr 27 Jun 1 Aug 10 – Aug 20
Hungarian Hot Wax Pepper pepper Apr 27 Jun 1 Aug 5 – Aug 15
Jalapeño Peppers pepper Apr 27 Jun 1 Aug 5 – Aug 15
Mariachi Peppers pepper Apr 27 Jun 1 Aug 6 – Aug 15
Poblano Peppers pepper Apr 27 Jun 1 Aug 5 – Aug 15
Serrano Peppers pepper Apr 27 Jun 1 Aug 10 – Aug 20
Thai Hot Peppers pepper Apr 27 Jun 1 Aug 15 – Aug 25

Plant Outside in April

Plant Type Action Target Date Harvest Window
Alaska Early Pea legume Transplant Apr 27 Jun 21 – Jun 26
Broad Windsor Fava Bean legume Transplant Apr 27 Jul 11 – Jul 21
Cascadia Sugar Snap Pea legume Transplant Apr 27 Jul 1 – Jul 3
Charleston Wakefield Cabbage brassica Transplant Apr 27 Jul 11
Chervil herb Transplant Apr 27 Jun 1 – Jun 11
Crimson Cherry Rhubarb Root vegetable Transplant Apr 20 Perennial — see plant page
Dandelion herb Transplant Apr 27 Perennial — see plant page
Delicatesse Blue Kohlrabi brassica Transplant Apr 27 Jun 21 – Jun 26
Delicatesse White Kohlrabi brassica Transplant Apr 27 Jun 21 – Jun 26
Dutch Yellow Shallots allium Transplant Apr 20 Jul 19 – Aug 18
Early Jersey Wakefield Cabbage brassica Transplant Apr 27 Jul 1 – Jul 11
French Red Shallots allium Transplant Apr 20 Jul 19 – Aug 18
Green Arrow Pea legume Transplant Apr 27 Jul 1 – Jul 6
Hard Red Wheat Cover Crop cover crop Transplant Apr 27 Jul 11 – Jul 31
Holland Red Shallots allium Transplant Apr 20 Jul 19 – Aug 18
Little Marvel Pea legume Transplant Apr 27 Jun 26 – Jun 29
Mammoth Melting Sugar Snow Pea legume Transplant Apr 27 Jul 4 – Jul 10
Michihili Cabbage brassica Transplant Apr 27 Jul 6
Oregon Giant Snow Pea legume Transplant Apr 27 Jul 6 – Jul 10
Oregon Sugar Pod Snow Pea legume Transplant Apr 27 Jun 26 – Jul 4
Progress No. 9 Shelling Pea legume Transplant Apr 27 Jun 24 – Jun 28
Red Acre Cabbage brassica Transplant Apr 27 Jul 11 – Jul 16
Sugar Ann Snap Pea legume Transplant Apr 27 Jun 18 – Jun 22
Vienna Purple Kohlrabi brassica Transplant Apr 27 Jun 21 – Jul 1
Vienna White Kohlrabi brassica Transplant Apr 27 Jul 1
Wando Pea legume Transplant Apr 27 Jun 29 – Jul 4

Harvest in April

Nothing to harvest in April for Zone 3B.
Next window: June — 52 varieties, including Alaska Early Pea, Astro Arugula, Beauty Pink Radishes.

Key Tasks for April in Zone 3B

  1. 1 Start 97 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 Harden off transplants before moving outdoors — set them outside in a sheltered spot for increasing hours over 7–10 days before planting in the ground.
  3. 3 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 3B planting calendar
March April in Zone 3B May

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