Zone 3a planting calendar

What to plant in June — zone 3a

Zone 3a averages its last spring frost around May 30 and its first fall frost around September 10. Everything below is timed from those two dates, so it stays useful whether you're planting for summer or for a fall harvest.

Last frost: May 30
First frost: September 10
Winter lows: -40 to -35 °F

Start indoors for fall

  • Kalearound Jun 2

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

  • Broccoliaround Jun 13

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

  • Kalearound Jun 30

    Seedlings need 4 weeks before they go out for a fall harvest.

Direct sow for fall

  • Parsleyaround Jun 4

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

  • Bush beanaround Jun 9

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

  • Lettucearound Jun 10

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

  • Peaaround Jun 14

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

  • Cilantroaround Jun 15

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

  • Carrotaround Jun 15

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

  • Beetaround Jun 19

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

  • Dillaround Jun 19

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

Direct sow

  • Bush beanaround Jun 6

    Soil is ready 1 weeks after last frost.

  • Basilaround Jun 13

    Soil is ready 2 weeks after last frost.

  • Bush beanaround Jun 13

    Warm soil — first summer sowing of bush bean.

  • Beetaround Jun 27

    Warm soil — first summer sowing of beet.

Transplant out

  • Tomatoaround Jun 13

    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 13

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

Garden care

  • Mulch every bedaround Jun 20

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

  • Set up deep wateringaround Jun 27

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

Succession sow

  • Bush beanaround Jun 27

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

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