Zone 3b planting calendar

What to plant in June: zone 3b

Zone 3b averages its last spring frost around May 25 and its first fall frost around September 15. Everything below is timed from those two dates, so it stays useful whether you're planting for summer or for a fall harvest.

These are zone-average dates. Check an area-level frost estimate from thirty years of nearby weather history and this calendar retimes itself.
Last frost: May 25
First frost: September 15
Winter lows: -35 to -30 °F
Zone 3b Almanac. What growers here actually recorded: sowing weeks, days to first pick, and yields.

Direct sow

  • Bush beanaround Jun 1

    Soil is ready 1 weeks after last frost.

  • Dry Bush Beanaround Jun 1

    Soil is ready 1 weeks after last frost.

  • Sunflower (Seed)around Jun 1

    Soil is ready 1 weeks after last frost.

  • Summer Savoryaround Jun 1

    Soil is ready 1 weeks after last frost.

  • Boragearound Jun 1

    Soil is ready 1 weeks after last frost.

  • Basilaround Jun 8

    Soil is ready 2 weeks after last frost.

  • Pumpkinaround Jun 8

    Soil is ready 2 weeks after last frost.

  • Buckwheataround Jun 8

    Soil is ready 2 weeks after last frost.

  • Bush beanaround Jun 8

    Warm soil: first summer sowing of bush bean.

  • Basilaround Jun 8

    Warm soil: first summer sowing of basil.

  • Beetaround Jun 22

    Warm soil: first summer sowing of beet.

  • Carrotaround Jun 22

    Warm soil: first summer sowing of carrot.

Start indoors for fall

  • Kalearound Jun 7

    Fall kale window opens. Sow trays any time in the next four weeks.

  • Broccoliaround Jun 18

    Seedlings need 5 weeks before they go out for a fall harvest.

Transplant out

  • Tomatoaround Jun 8

    Safe to set out 2 weeks after last frost. Bury 2/3 of the transplant stem. Roots form along the buried stem for a stronger plant.

  • Basilaround Jun 8

    Safe to set out 2 weeks after last frost. Pinch flower spikes the moment you see them: leaves stay sweet all season.

  • Brussels Sproutsaround Jun 8

    Safe to set out 2 weeks after last frost. This is a fall crop: frost is what turns the sprouts sweet. Around 4 weeks before harvest, top the growing tip so the plant pushes size into the sprouts.

  • Pumpkinaround Jun 8

    Safe to set out 2 weeks after last frost. Count back 100 days from your first frost to time a Halloween harvest. Cure cut pumpkins in the sun for 10 days and leave 3 in of stem so they store for months.

  • Summer Savoryaround Jun 8

    Safe to set out 2 weeks after last frost. Harvest just before flowering for the best flavor, then shear the whole plant back for a second flush.

  • Lovagearound Jun 8

    Safe to set out 2 weeks after last frost. Grows 4-6 ft tall once established; give it the back of the bed and divide the crown every few years to keep it productive.

  • Catniparound Jun 8

    Safe to set out 2 weeks after last frost. Fence it off if cats roam the neighborhood: they'll flatten the plant and any seedlings around it rolling in the scent.

  • Elderberryaround Jun 8

    Safe to set out 2 weeks after last frost. Plant two different cultivars for better fruit set; cut clusters when berries turn deep purple-black and cook before eating, never raw.

  • Black Currantaround Jun 8

    Safe to set out 2 weeks after last frost. Check state rules before planting: currants can be restricted near white pine stands due to blister rust; resistant cultivars exist where it's allowed.

  • Gooseberryaround Jun 8

    Safe to set out 2 weeks after last frost. Prune to an open vase shape each dormant season; good airflow through the center is the best defense against mildew.

  • Safe to set out 2 weeks after last frost. Fruit looks ripe well before it's ready; wait until berries turn nearly black and soften slightly to avoid the sharp astringency of early picking.

  • Safe to set out 2 weeks after last frost. Plant two different cultivars for pollination; it flowers and fruits earlier than almost any other berry, often before strawberries.

  • Safe to set out 2 weeks after last frost. Needs one male plant for every 6-8 females to fruit; the branches are thorny, so many growers cut whole fruited branches to harvest rather than pick berry by berry.

  • Cranberryaround Jun 8

    Safe to set out 2 weeks after last frost. Needs boggy, acidic soil, pH 4-5; without a naturally wet, peaty spot, grow it in a lined bed you can flood periodically.

  • Lingonberryaround Jun 8

    Safe to set out 2 weeks after last frost. Mulch with pine needles or peat to hold the acidic soil pH it needs; it can produce two crops a year in longer seasons.

  • Safe to set out 2 weeks after last frost. Netting is close to mandatory: birds often strip a tree bare within a day or two of the berries ripening.

  • Chokecherryaround Jun 8

    Safe to set out 2 weeks after last frost. Leaves, twigs, and pits contain cyanogenic compounds and are toxic to people and livestock. Use only the cooked, strained pulp, and keep wilted prunings away from animals.

  • Highbush Cranberryaround Jun 8

    Safe to set out 2 weeks after last frost. Fruit is sour and best after frost; buy the American species rather than the European lookalike, whose fruit is bitter and far less useful.

  • Sweet Potatoaround Jun 15

    Safe to set out 3 weeks after last frost. Plant rooted slips, not seed. Wait until soil holds 65F, then let vines sprawl and cure roots at 80F for 10 days before storage: that curing step is what makes them sweet.

Direct sow for fall

  • Parsleyaround Jun 9

    Fall parsley window opens. Sowing now beats the last-minute date by a month of growth.

  • Bush beanaround Jun 14

    Fall bush bean window opens. Sowing now beats the last-minute date by a month of growth.

  • Lettucearound Jun 15

    Succession sowing 3 of 3. Sow every 21 days for a steady cut.

  • Peaaround Jun 19

    Fall pea window opens. Sowing now beats the last-minute date by a month of growth.

  • Cilantroaround Jun 20

    Succession sowing 3 of 3. Sow every 21 days for a steady cut.

  • Carrotaround Jun 20

    Fall carrot window opens. Sowing now beats the last-minute date by a month of growth.

  • Beetaround Jun 24

    Fall beet window opens. Sowing now beats the last-minute date by a month of growth.

  • Dillaround Jun 24

    Fall dill window opens. Sowing now beats the last-minute date by a month of growth.

Garden care

  • Mulch every bedaround Jun 15

    3-4 in of straw or leaves now holds water, blocks weeds, and cools roots for the whole summer.

  • Switch to fewer, longer soaks (1-1.5 in/week at the root) instead of daily sprinkles.

Succession sow

  • Bush beanaround Jun 22

    Sowing 2: replant every 14 days so one planting never has to feed you all season.

  • Basilaround Jun 29

    Sowing 2: replant every 21 days so one planting never has to feed you all season.

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