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Zone 4a — The Colonial Outskirts
short to moderate growing season · Frost-free ~110-140 days · Min temp -30°F to -25°F
Where the original settlements expanded their boundaries. This transitional zone nurtures apple trees, Virginia creeper, and phlox that graced early American homesteads. The 115-day growing season allowed colonists to finally look beyond mere survival toward prosperity. Your garden carries the genetic memory of those first expansions from coastal strongholds.
Zone 4a · short to moderate growing season
❄️ Frost Dates — Zone 4a
Average Last Spring Frost
May 15
Plant warm-weather crops after this date. Check 10-day forecasts before setting out tender plants.
Average First Fall Frost
September 21
Count back from this date to know how long your growing window is.
Growing Season
short to moderate
Frost-Free Period
~110-140 days
Min Temperature
-30°F to -25°F
📍 Where is Zone 4a?
Southern Minnesota, Wisconsin, Iowa, parts of New York, northern New England
🌱 Soil & Growing Notes
Glacially-deposited silty loam in many areas. Generally fertile but can be compacted. Add organic matter yearly.
📅 Zone 4a Month-by-Month Planting Calendar
Approximate timing based on average last frost May 15 and first fall frost September 21. Always confirm with a 10-day forecast before transplanting tender crops.
JanRest period — plan & prepare
Feb
🪴 Start Indoors: Peppers, Eggplant, Onions
Mar
🪴 Start Indoors: Tomatoes, Peppers, Eggplant, Cabbage, Broccoli
🌱 Direct Sow: Lettuce, Spinach, Radishes, Peas, Carrots
Apr
🌱 Direct Sow: Lettuce, Spinach, Radishes, Peas, Carrots
🌿 Transplant: Cabbage, Broccoli, Lettuce
Soil warming — harden off transplants. Direct sow cold-tolerant crops.
May
🌱 Direct Sow: Beans, Cucumbers, Zucchini, Corn
🌿 Transplant: Tomatoes, Peppers, Eggplant, Cabbage, Broccoli, Lettuce
🌽 Harvest: Spring Radishes, Lettuce, Spinach
Last frost around this month. Safe to transplant warm-season crops outdoors.
Jun
🪴 Start Indoors: Broccoli (fall), Kale (fall)
🌱 Direct Sow: Beans, Cucumbers, Zucchini, Corn
🌿 Transplant: Tomatoes, Peppers, Eggplant
🌽 Harvest: Lettuce, Spinach, Peas, Garlic (if planted last fall)
Jul
🪴 Start Indoors: Broccoli (fall), Kale (fall)
🌱 Direct Sow: Beans, Cucumbers, Zucchini, Corn, Lettuce (fall), Spinach (fall), Radishes (fall)
🌽 Harvest: Lettuce, Spinach, Beans, Cucumbers, Zucchini, Tomatoes, Peppers, Kale, Carrots, Broccoli
Aug
🌱 Direct Sow: Lettuce (fall), Spinach (fall), Radishes (fall), Garlic
🌽 Harvest: Beans, Cucumbers, Zucchini, Tomatoes, Peppers, Kale, Carrots, Broccoli
Begin fall harvest. Protect tomatoes and peppers on cold nights with row cover.
Sep
🌽 Harvest: Kale, Carrots, Broccoli
First fall frost likely. Harvest remaining warm-season crops before a hard freeze.
OctRest period — plan & prepare
NovRest period — plan & prepare
DecRest period — plan & prepare
What Grows Well in Zone 4a?
Zone 4a has a short to moderate growing season with roughly ~110-140 days of frost-free weather — last spring frost around May 15, first fall frost around September 21. That's enough time for 69+ popular garden plants, from fast-growing leafy greens to longer-season fruiting crops. Below is our curated list of plants that thrive in your zone.
🥕 Best Vegetables for Zone 4a
🌱
Asparagus
730 days · $19.99
🥕
Beets
50-70 days · $2.49
🫑
Bell Peppers
60-90 days · $3.49
🥦
Broccoli
60-90 days · $2.99
🥬
Brussels Sprouts
90-120 days · $2.99
🎃
Butternut Squash
90-110 days · $3.49
🥬
Cabbage
70-100 days · $2.49
🥕
Carrots
75 days · $3.99
🥦
Cauliflower
55-100 days · $2.99
🍅
Cherry Tomatoes
60-80 days · $3.49
🥒
Cucumbers
55 days · $4.49
🍆
Eggplants
70-90 days · $3.99
🧄
Garlic
240 days · $12.99
🫘
Green Bean
50-60 days · $3.49
🌱
Green Beans
50 days · $4.99
🌶️
Jalapeños
65-80 days · $3.49
🥬
Kale
55-75 days · $2.49
🥬
Lettuce
45 days · $3.49
🧅
Onion
100 days · $4.99
🟢
Peas
60 days · $4.49
🌱
Pepper (Bell & Sweet)
70 days · $5.99
🥔
Potato
90 days · $8.99
🎃
Pumpkins
90-120 days · $3.49
🔴
Radish
22-30 days · $1.99
🌱
Rhubarb
365 days · $4.99
🥬
Spinach
40 days · $3.49
🌽
Sweet Corn
60-100 days · $2.99
🥬
Swiss Chard
50-60 days · $2.49
🌱
Tomato
75 days · $5.99
🍅
Tomatoes
80-100 days · $3.99
🥒
Zucchini
50 days · $4.49
🥬
Celery
130 days · $3.49
🥬
Turnips
55 days · $2.99
🥒
Pickling Cucumbers
52 days · $4.49
🧅
Leeks
120 days · $3.99
🌿
Arugula
40 days · $3.49
🌿
Fennel
90 days · $3.99
🥬
Kohlrabi
55 days · $3.49
🌿
Horseradish
365 days · $8.99
🥬
Collard Greens
70 days · $3.49
🥕
Parsnips
120 days · $3.99
🌿 Best Herbs for Zone 4a
🌿
Basil
30 days
🌿
Chives
30 days
🌿
Cilantro
45-70 days
🌿
Dill
40-60 days
🌿
Mint
30 days
🌿
Oregano
45 days
🌿
Parsley
70 days
🌿
Sage
75-90 days
🌿
Thyme
60 days
🌸 Companion Flowers for Zone 4a
🌼
Marigolds
60 days
🌺
Nasturtiums
55 days
🌻
Sunflowers
80 days
🌸
Borage
60 days
🌼
Chamomile
90 days
🌸
Hyssop
120 days
🌼
Tansy
120 days
🌿
Rue
120 days
🍓 Best Fruits for Zone 4a
🍎
Apple Tree
1095 days
🫐
Blueberry Bush
730 days
🍈
Cantaloupes
75-100 days
🍇
Grape Vine
1095 days
🍐
Pear Tree
1095 days
🍑
Plum Tree
1095 days
🍒
Cherry Tree
1095 days
🍇
Raspberry
365 days
🍓
Strawberry
365 days
🍉
Watermelons
70-90 days
🌰
Black Walnut
3650 days
🐝
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