Short answer: October is quieter on new sowing than the last two months — cucumber is the only window opening for the first time — but it's the busiest month yet for everything else. Tomato finally goes outside as a transplant, and five spring crops (broad beans, brussels sprouts, kale, mustard greens, turnip) all close their sowing windows before the month is out.

The NZ Temperate October Growing Context

The frost period runs to the end of November, so it isn't over, but risk is genuinely easing — enough that tomato's transplant window opens this month, the first time all year it's safe to move seedlings outside. Soil has warmed enough for cucumber's first sowing too, while several of spring's early brassicas and legumes are running out their sowing windows rather than opening new ones.

Typical October conditions in temperate gardens:

  • Frost risk easing, though the period technically runs to November
  • One new sowing window: cucumber
  • Tomato's transplant window opens — the first safe month to plant out
  • Five crops close their sowing windows this month
  • Seven crops in active harvest, the broadest list since autumn

What to Sow This Month

Cucumber — the only new window

Cucumber's sowing window opens in October and runs through January, the only genuinely new sowing this month. Start seeds in trays about a month before the last frost and plant out only once frost risk has passed — expect 60–80 days from transplant to harvest.

Cultivar picks: Amira F1 or Crunchy F1 (both Kings Seeds NZ), both raised as transplants.

Last call: five crops closing out

  • Broad Beans — sowing window closes at the end of October, open since August.
  • Brussels Sprouts — closes at the end of October, open since September.
  • Kale — closes at the end of October, open since August.
  • Mustard Greens — closes at the end of October, open since September.
  • Turnip — closes at the end of October, open since August; it dislikes summer heat, so this is genuinely the last sensible window until autumn.

Still open

Basil, beetroot, carrot, coriander, lettuce, mizuna, pak choy, peas, radish, silverbeet and spinach all continue from earlier months — none of them are new this month, but all remain sowable if you haven't started yet.

Transplant This Month

Tomato is the headline event: its transplant window opens in October and runs through December, the first month all year it's safe to move seedlings from trays into open ground. Plant out only after the last frost, not on the strength of one warm week — an unexpected late frost can undo months of tray-raising in a single night.

Brussels sprouts and mustard greens also move to transplanting this month (both sown in September), and broccoli and kale — already transplanting since September — continue.

What to Harvest This Month

  • Beetroot, Silverbeet — both comfortably within their long harvest windows.
  • Coriander, Mizuna, Pak Choy — all cut-and-come-again crops from earlier sowings; pick outer leaves rather than pulling whole plants.
  • Radish — pull as roots size up rather than letting them sit and turn woody.
  • Turnip — pull promptly once ready; summer heat is what ends its usefulness, not this month's conditions.

Garden Jobs for October

Harden off tomato seedlings before planting out

Trays raised indoors need a week or two outside in a sheltered spot before going into open ground — seedlings moved straight from a warm windowsill to an open bed often stall or scorch.

Get support in place before it's needed

Cucumber and tomato both benefit from stakes, cages or trellis set up at planting time rather than added once the plant is already sprawling. Fitting support around an established plant risks damaging roots and stems.

Clear beds as the last-call crops finish sowing

Broad beans, brussels sprouts, kale, mustard greens and turnip all close their windows this month — use any remaining bed space for these now rather than leaving gaps once November's crops need it.

Common October Mistakes

Planting tomato out on one warm week

The frost period doesn't end until November. A mild October stretch isn't the same as the last frost — wait for the window's timing, not a lucky forecast.

Missing the last-call sowings

Five crops close their windows this month. Waiting until "next month" for broad beans, brussels sprouts, kale, mustard greens or turnip means waiting until next year instead.

Skipping hardening off

Seedlings raised entirely indoors or in a greenhouse can scorch or stall when planted straight into open ground. A gradual week or two outside first makes the difference.

Looking Ahead

November closes out the temperate zone's frost period and opens courgette's sowing window — the last of the major warm-season crops to start. Tomato, transplanted this month, will be settling into open ground, and cucumber's first sowing will be approaching its own transplant stage.

Ready for next month? See *What to Plant in NZ Temperate in November*, or explore the full NZ Temperate Planting Calendar →.