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Zone 4B — April

What to Plant in April in Zone 4B

April in Zone 4B: 146 crops to start indoors, 85 to plant or direct sow outside, and 0 entering harvest window. Last frost averages May 11. Reference city: St. Cloud, MN.
Updated August 12, 2026 · Frost data from NOAA 1991-2020 Climate Normals
146 Start Indoors
85 Plant Outside
0 Harvest
Frost window: Active

This is when frost can still happen in Zone 4B. The last spring frost typically lands on May 11, with a 10% chance of frost as late as May 25. Plan transplants with this window in mind.

See full Zone 4B frost outlook

Start Indoors in April

Plant Type Start Indoors Transplant Outside Harvest Window
Abe Lincoln Tomatoes tomato Apr 6 May 25 Aug 13 – Aug 23
Ace 55 Tomatoes tomato Apr 6 May 25 Aug 13 – Aug 18
Amish Paste Tomatoes tomato Apr 6 May 25 Aug 7 – Aug 18
Anna Russian Tomatoes tomato Apr 6 May 25 Aug 3
Atkinson Tomatoes tomato Apr 6 May 25 Aug 3 – Aug 13
Aunt Molly's Ground Cherry vegetable Apr 6 May 25 Aug 3 – Aug 23
Aunt Ruby's German Green Tomatoes tomato Apr 6 May 25 Aug 13
Basil Herb Mix herb Apr 13 May 18 Jul 17 – Aug 6
Better Boy Tomatoes tomato Apr 6 May 25 Aug 3 – Aug 8
Big Beef Tomatoes tomato Apr 6 May 25 Aug 3
Big Boy Tomatoes tomato Apr 6 May 25 Aug 11
Big Rainbow Tomatoes tomato Apr 6 May 25 Aug 18 – Aug 28
Bitter melons vegetable Apr 27 May 25 Aug 8 – Aug 23
Black Beauty Zucchini squash Apr 24 May 22 Jul 6 – Jul 16
Black Cherry Tomatoes tomato Apr 6 May 25 Jul 28 – Aug 8
Black From Tula Tomatoes tomato Apr 6 May 25 Aug 18
Black Krim Tomatoes tomato Apr 6 May 25 Aug 8 – Aug 13
Black Pearl Tomatoes tomato Apr 6 May 25 Jul 29
Blondkopfchen Tomatoes tomato Apr 6 May 25 Aug 8 – Aug 13
Bonny Best Tomatoes tomato Apr 6 May 25 Aug 8 – Aug 13
Bradley Tomatoes tomato Apr 6 May 25 Aug 8 – Aug 13
Broccolini brassica Apr 20 May 25 Jul 14 – Jul 24
Brussels Sprouts brassica Apr 20 May 25 Aug 18 – Sep 12
Calendula flower Apr 6 May 25 Jul 14 – Jul 24
Calypso Tomatoes tomato Apr 6 May 25 Aug 8 – Aug 13
Caribe Tomatoes tomato Apr 6 May 25 Aug 8 – Aug 18
Carmello Tomatoes tomato Apr 6 May 25 Aug 3 – Aug 8
Celebrity Tomatoes tomato Apr 6 May 25 Aug 3 – Aug 5
Chadwick's Cherry Tomatoes tomato Apr 6 May 25 Aug 3 – Aug 23
Chocolate Cherry Tomatoes tomato Apr 6 May 25 Aug 3 – Aug 8
Chocolate Stripes Tomatoes tomato Apr 6 May 25 Aug 13
Cinnamon Basil herb Apr 13 May 18 Jul 22 – Aug 6
Classic Tomatillos vegetable Apr 13 May 18 Aug 6 – Aug 11
Clemson Spineless Okra vegetable Apr 20 May 25 Jul 19 – Jul 28
Cosmos flower Apr 20 May 25 Aug 3 – Aug 23
Costoluto Genovese Tomatoes tomato Apr 6 May 25 Aug 3 – Aug 13
Crackerjack Mix Marigolds flower Apr 6 May 11 Jul 10 – Jul 25
Creole Tomatoes tomato Apr 6 May 25 Aug 3 – Aug 11
Crimson Sweet Watermelon melon Apr 27 May 25 Aug 13 – Aug 23
Cupid Grape Tomatoes tomato Apr 6 May 25 Jul 29 – Aug 3
Dark Opal Basil herb Apr 6 May 25 Jul 24 – Aug 8
Delica Kabocha Squash squash Apr 27 May 25 Aug 28 – Sep 12
Delicata Squash squash Apr 27 May 25 Aug 13 – Sep 2
Delicious Tomatoes tomato Apr 6 May 25 Aug 8 – Aug 13
Dolce Fresca Basil herb Apr 6 May 25 Jul 24 – Aug 3
Early Girl Tomatoes tomato Apr 6 May 25 Jul 16 – Jul 26
Early White Bush Scallop Pattypan Squash squash Apr 27 May 25 Jul 11 – Jul 19
Egg Tomatoes tomato Apr 6 May 25 Aug 8 – Aug 13
Five Star Grape Tomatoes tomato Apr 6 May 25 Jul 26
Floradade Tomatoes tomato Apr 6 May 25 Aug 3 – Aug 8
French Marigold flower Apr 20 May 25 Jul 14 – Jul 24
Gardener's Delight Tomatoes tomato Apr 6 May 25 Jul 24 – Aug 8
Genovese Basil herb Apr 6 May 25 Jul 24 – Aug 3
German Chamomile herb Apr 20 May 25 Jul 24 – Jul 29
German Johnson Tomatoes tomato Apr 6 May 25 Aug 18
Glacier Tomatoes tomato Apr 6 May 25 Jul 19 – Jul 22
Golden Sunray Tomatoes tomato Apr 6 May 25 Aug 8 – Aug 13
Greek Basil herb Apr 13 May 18 Jul 22 – Aug 1
Green Cabbage brassica Apr 20 May 25 Jul 24 – Sep 2
Green Envy Tomatoes tomato Apr 6 May 25 Jul 24 – Aug 3
Green Grape Tomatoes tomato Apr 6 May 25 Jul 29 – Aug 11
Green shiso leaves herb Apr 13 May 18 Jul 17 – Jul 27
Green Zebra Tomatoes tomato Apr 6 May 25 Aug 8 – Aug 11
Hale's Best Jumbo Cantaloupe melon Apr 27 May 25 Aug 13 – Aug 23
Hillbilly Tomatoes tomato Apr 6 May 25 Aug 18
Homestead Tomatoes tomato Apr 6 May 25 Aug 13 – Aug 18
Honey Bee Tomatoes tomato Apr 6 May 25 Jul 24
Indigo Rose Tomatoes tomato Apr 6 May 25 Aug 8 – Aug 23
Italian Large Leaf Basil herb Apr 13 May 18 Jul 17 – Aug 1
Jack O'Lantern Pumpkin squash Apr 27 May 25 Aug 23 – Sep 12
Jaune Flamme Tomatoes tomato Apr 6 May 25 Aug 13
Jet Star Tomatoes tomato Apr 6 May 25 Aug 3 – Aug 5
Jubilee Tomatoes tomato Apr 6 May 25 Aug 8 – Aug 13
Juliet Tomatoes tomato Apr 6 May 25 Jul 23 – Jul 25
Kapoor Tulsi (Holy Basil) herb Apr 6 May 25 Jul 24
Large Red Cherry Tomatoes tomato Apr 6 May 25 Aug 3 – Aug 13
Lettuce Leaf Basil herb Apr 13 May 18 Jul 22 – Aug 6
Licorice Basil herb Apr 13 May 18 Jul 22 – Aug 6
Lime Basil herb Apr 13 May 18 Jul 22 – Aug 1
Luffa gourds vegetable Apr 20 May 25 Sep 2 – Sep 22
Manitoba Tomatoes tomato Apr 6 May 25 Jul 30
Marglobe Improved Tomatoes tomato Apr 6 May 25 Aug 5
Marglobe Supreme Tomatoes tomato Apr 6 May 25 Aug 3 – Aug 13
Marion Tomatoes tomato Apr 6 May 25 Aug 8 – Aug 13
Marketmore 76 Cucumber cucumber Apr 27 May 25 Jul 22 – Aug 1
Midnight Snack Tomatoes tomato Apr 6 May 25 Jul 29 – Aug 3
Money Maker Tomatoes tomato Apr 6 May 25 Aug 8 – Aug 18
Mountain Magic Tomatoes tomato Apr 6 May 25 Aug 5 – Aug 8
Mr. Stripey Tomatoes tomato Apr 6 May 25 Aug 13
Mucho Nacho Jalapeño Peppers pepper Apr 6 May 25 Aug 1 – Aug 3
Napoletano Basil herb Apr 6 May 25 Aug 8
Orange Oxheart Tomatoes tomato Apr 6 May 25 Aug 8 – Aug 18
Oregon Spring Tomatoes tomato Apr 6 May 25 Jul 22 – Aug 3
Orion Florence Fennel vegetable Apr 13 May 18 Aug 6
Patio Princess Tomatoes tomato Apr 6 May 25 Jul 29 – Aug 3
Pineapple Tomatoes tomato Apr 6 May 25 Aug 8 – Aug 18
Pink Delicious Tomatoes tomato Apr 6 May 25 Aug 13 – Aug 17
Pink Oxheart Tomatoes tomato Apr 6 May 25 Aug 13 – Aug 23
Pistou Basil herb Apr 6 May 25 Jul 24
Ponderosa Red Beefsteak Tomatoes tomato Apr 6 May 25 Aug 13 – Aug 23
Purple Basil herb Apr 6 May 25 Aug 3 – Aug 18
Purple Tomatillos vegetable Apr 13 May 18 Aug 1 – Aug 11
Red Cabbage brassica Apr 20 May 25 Jul 24 – Sep 2
Red Pear Tomatoes tomato Apr 6 May 25 Jul 29 – Aug 8
Red Robin Tomatoes tomato Apr 6 May 25 Jul 19
Red Rubin Basil herb Apr 6 May 25 Aug 5
Red Velvet Leaf Basil herb Apr 13 May 18 Jul 22 – Aug 6
Rio Grande Tomatoes tomato Apr 6 May 25 Aug 8 – Aug 13
Roma VF Tomatoes tomato Apr 6 May 25 Aug 8 – Aug 13
Romanesco brassica Apr 20 May 25 Aug 8 – Sep 2
Rutgers Tomato tomato Apr 6 May 25 Aug 3 – Aug 13
Sakura Tomatoes tomato Apr 6 May 25 Jul 19 – Jul 24
Scarlet Sage Flowers flower Apr 13 May 18 Perennial — see plant page
Snow Crown Cauliflower brassica Apr 20 May 25 Jul 14 – Jul 24
Spaghetti Squash squash Apr 27 May 25 Aug 21 – Sep 2
Sparky Mix Marigolds flower Apr 6 May 11 Jul 5 – Jul 20
Spicy Globe Basil herb Apr 6 May 25 Aug 3
Stupice Tomatoes tomato Apr 6 May 25 Jul 19 – Aug 3
Sugar Baby Watermelon melon Apr 27 May 25 Aug 8 – Aug 13
Sugar Pie Pumpkin squash Apr 27 May 25 Aug 23 – Sep 12
Sun Gold Tomatoes tomato Apr 6 May 25 Jul 21 – Jul 29
SunChocola Tomatoes tomato Apr 6 May 25 Jul 24 – Aug 3
Sungella Tomatoes tomato Apr 6 May 25 Jul 24 – Aug 3
Sunray Tomatoes tomato Apr 6 May 25 Aug 8 – Aug 13
Sweet 100 Tomatoes tomato Apr 6 May 25 Jul 24 – Jul 29
Sweet Alyssum flower Apr 6 May 25 Jul 4 – Jul 19
Sweet Million Tomatoes tomato Apr 6 May 25 Jul 24 – Jul 29
Sweet Treats Tomatoes tomato Apr 6 May 25 Jul 29 – Aug 8
Table Queen Acorn Squash squash Apr 27 May 25 Aug 13 – Sep 2
Thai Basil herb Apr 6 May 25 Jul 24 – Jul 29
Thessaloniki Tomatoes tomato Apr 6 May 25 Jul 25 – Aug 5
Tigerella Tomatoes tomato Apr 6 May 25 Jul 19 – Aug 3
Tiny Tim Tomatoes tomato Apr 6 May 25 Jul 9 – Jul 19
Tomatillo vegetable Apr 20 May 25 Jul 24 – Aug 18
Tri-X 313 Seedless Watermelon melon Apr 20 May 25 Jul 29 – Aug 8
Tumbling Tom Red Tomatoes tomato Apr 6 May 25 Jul 29 – Aug 3
Verde Tomatillos vegetable Apr 13 May 18 Aug 1 – Aug 11
VR Moscow Tomatoes tomato Apr 6 May 25 Aug 13 – Aug 23
Waltham 29 Broccoli brassica Apr 20 May 25 Aug 8 – Aug 23
Waltham Butternut Squash squash Apr 27 May 25 Sep 2 – Sep 22
White Cherry Tomatoes tomato Apr 6 May 25 Jul 23 – Aug 3
Yellow Beefsteak Tomatoes tomato Apr 6 May 25 Aug 8 – Aug 18
Yellow Crookneck Squash squash Apr 27 May 25 Jul 14 – Jul 24
Yellow Oxheart Tomatoes tomato Apr 6 May 25 Aug 12
Yellow Pear Tomatoes tomato Apr 6 May 25 Aug 3 – Aug 13
Zinnia flower Apr 20 May 25 Jul 24 – Aug 23

Plant Outside in April

Plant Type Action Target Date Harvest Window
AC Wendy Strawberry berry Plant Out Apr 27 Perennial — see plant page
Albion Strawberry berry Plant Out Apr 27 Perennial — see plant page
All Season Cabbage brassica Transplant Apr 27 Jul 6 – Jul 16
All Year Round Cauliflower brassica Transplant Apr 27 Jul 1
Allstar Strawberry berry Plant Out Apr 27 Perennial — see plant page
Berry Blue honeyberry shrubs berry Plant Out Apr 27 Perennial — see plant page
Blue Flax Flowers flower Direct Sow Apr 27 Perennial — see plant page
Bluecrop Blueberry berry Plant Out Apr 27 Perennial — see plant page
Bluegold Blueberry berry Plant Out Apr 27 Perennial — see plant page
Blueray Blueberry berry Plant Out Apr 27 Perennial — see plant page
Bouquet Dill herb Direct Sow Apr 27 Jun 16 – Jul 1
Brunswick Cabbage brassica Transplant Apr 27 Jul 26
Calabrese Broccoli brassica Transplant Apr 27 Jul 1
Candy Onion allium Plant Out Apr 6 Jul 5 – Jul 15
Carentan Leeks allium Transplant Apr 27 Jul 26 – Aug 15
Chandler Blueberry berry Plant Out Apr 27 Perennial — see plant page
Charleston Wakefield Cabbage brassica Transplant Apr 20 Jun 29
Chervil herb Direct Sow Apr 20 May 25 – Jun 4
Chinese Forget-Me-Not Flowers flower Direct Sow Apr 27 Jul 1 – Jul 21
Concord grape vines berry Plant Out Apr 27 Perennial — see plant page
Copenhagen Cabbage brassica Transplant Apr 27 Jul 1
Crimson Cherry Rhubarb Root vegetable Plant Out Apr 13 Perennial — see plant page
Dandelion herb Direct Sow Apr 20 Perennial — see plant page
Danish Ballhead Cabbage brassica Transplant Apr 27 Aug 5 – Aug 15
Di Cicco Broccoli brassica Transplant Apr 27 Jun 11 – Jun 14
Drumhead Cabbage brassica Transplant Apr 27 Jul 26 – Aug 5
Dukat Dill herb Direct Sow Apr 27 Jun 6 – Jun 16
Duke Blueberry berry Plant Out Apr 27 Perennial — see plant page
Dutch Yellow Shallots allium Plant Out Apr 13 Jul 12 – Aug 11
Earliglow Strawberry berry Plant Out Apr 27 Perennial — see plant page
Early Jersey Wakefield Cabbage brassica Transplant Apr 20 Jun 24 – Jul 4
Early Purple Broccoli brassica Transplant Apr 27 Jul 1
Elliott Blueberry berry Plant Out Apr 27 Perennial — see plant page
Evergreen Parsley herb Direct Sow Apr 27 Jul 6 – Jul 21
Fenugreek herb Direct Sow Apr 27 Jun 1 – Jun 16
Fort Laramie Strawberry berry Plant Out Apr 27 Perennial — see plant page
French Red Shallots allium Plant Out Apr 13 Jul 12 – Aug 11
Giant Imperial Mix Larkspur Flowers flower Direct Sow Apr 20 Jul 29 – Aug 18
Giant Musselburgh Leeks allium Transplant Apr 27 Aug 10
Glory of Enkhuizen Cabbage brassica Transplant Apr 27 Jul 26
Golden Acre Cabbage brassica Transplant Apr 27 Jul 1
Hamburg Rooted Parsley herb Direct Sow Apr 27 Jul 26 – Aug 15
Hard Red Wheat Cover Crop cover crop Direct Sow Apr 20 Jul 4 – Jul 24
Heritage Raspberry berry Plant Out Apr 27 Perennial — see plant page
Holland Red Shallots allium Plant Out Apr 13 Jul 12 – Aug 11
Honeoye Strawberry berry Plant Out Apr 27 Perennial — see plant page
Honeycrisp apple trees berry Plant Out Apr 27 Perennial — see plant page
Igloo Cauliflower brassica Transplant Apr 27 Jul 1 – Jul 6
Invicta gooseberry shrubs berry Plant Out Apr 27 Perennial — see plant page
Jersey Blueberry berry Plant Out Apr 27 Perennial — see plant page
Jersey Knight Asparagus vegetable Plant Out Apr 27 Perennial — see plant page
Jewel Strawberries berry Plant Out Apr 27 Perennial — see plant page
King Richard Leek allium Transplant Apr 13 Jun 27
Legacy Blueberry berry Plant Out Apr 27 Perennial — see plant page
Mammoth Dill herb Direct Sow Apr 27 Jun 11 – Jul 1
Mara des Bois Strawberry berry Plant Out Apr 27 Perennial — see plant page
Mary Washington Asparagus vegetable Plant Out Apr 27 Perennial — see plant page
Medium Red Clover Cover Crop cover crop Direct Sow Apr 27 Jun 26 – Jul 11
Michihili Cabbage brassica Transplant Apr 20 Jun 29
Millennium Asparagus vegetable Plant Out Apr 27 Perennial — see plant page
Northblue Blueberry berry Plant Out Apr 27 Perennial — see plant page
Northland Blueberry berry Plant Out Apr 27 Perennial — see plant page
OG American Flag Leeks allium Transplant Apr 27 Jul 26 – Aug 5
Ozark Beauty Strawberry berry Plant Out Apr 27 Perennial — see plant page
Patriot Blueberry berry Plant Out Apr 27 Perennial — see plant page
Purple Passion Asparagus vegetable Plant Out Apr 27 Perennial — see plant page
Quinault Strawberry berry Plant Out Apr 27 Perennial — see plant page
Rapeseed Cover Crop cover crop Direct Sow Apr 27 Jun 11 – Jul 6
Raspberry Shortcake berry Plant Out Apr 27 Perennial — see plant page
Red Acre Cabbage brassica Transplant Apr 20 Jul 4 – Jul 9
Red Lake currant shrubs berry Plant Out Apr 27 Perennial — see plant page
San Andreas Strawberries berry Plant Out Apr 27 Perennial — see plant page
Savoy Perfection Cabbage brassica Transplant Apr 27 Jul 26 – Jul 31
Scarlet Flax Flowers flower Direct Sow Apr 27 Jun 21 – Jul 6
Shallot allium Plant Out Apr 20 Jul 19 – Aug 18
Snowball Self-Blanche Cauliflower brassica Transplant Apr 27 Jul 1
Sparkle Strawberry berry Plant Out Apr 27 Perennial — see plant page
Surecrop Strawberry berry Plant Out Apr 27 Perennial — see plant page
Top Hat Blueberry berry Plant Out Apr 27 Perennial — see plant page
Toro Blueberry berry Plant Out Apr 27 Perennial — see plant page
Tristar Strawberry berry Plant Out Apr 27 Perennial — see plant page
Victoria Rhubarb vegetable Transplant Apr 27 Perennial — see plant page
Viola and pansy edible flowers flower Transplant Apr 27 Jun 26 – Jul 6
Violetta Purple Cauliflower brassica Transplant Apr 27 Jul 1
Yellow Sweet Blossom Clover Cover Crop cover crop Direct Sow Apr 27 Jun 26 – Jul 26

Harvest in April

Nothing to harvest in April for Zone 4B.
Next window: May — 6 varieties, including Astro Arugula, Black Oil Sunflower Microgreens, Chervil.

Key Tasks for April in Zone 4B

  1. 1 Start 146 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 Direct sow seeds at the recommended depth and spacing. Keep the seedbed consistently moist until germination is complete.
  4. 4 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 4B planting calendar
March April in Zone 4B May

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