Buckwheat · Yokohama, Kanagawa, Japan

When to plant buckwheat in Yokohama

Main outdoor window

8-22 Apr

The window this page is built around.

Timed from last spring frost

1 April

In Yokohama, on your chosen risk.

Ready to pick

17 Jun - 7 Jul

If you plant at the start of the window.

The average last frost. Half of all years are later than this.

Cautious Balanced Bold

Step by step in Yokohama

Each window is a range, not a single day. Earlier in the range buys you a longer season; later in it buys you a safer one.

Sow direct

8-22 Apr

One week after your last frost.

Harvest

17 Jun - 7 Jul

Sow in succession. A single sowing gives you a single glut. Sow a short row every 30 days through the window above and you get a steady supply instead.

Frost tolerance

Tender

Damaged below

0°C (32°F)

Days to maturity

70–90

Min soil temp

10°C (50°F)

Spacing

15 cm

Sowing depth

20 mm (0.8 in)

Sun

Full

Buckwheat through the year

Against the frost risk in Yokohama

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Buckwheat

Frost risk Sow direct Harvest Today

Why these dates

Sow after the last frost, any time up to about eleven weeks before the first. Because it matures so fast it can follow an early crop and still finish, and it smothers weeds while doing so.

Killed outright by the lightest frost, which is exactly why it works as a summer cover crop that clears itself away in autumn.

Seed packets and extension guides express timing as weeks either side of the last spring frost, because that is the only reference point that travels. Buckwheat are timed for direct sowing 1 weeks after it, and this page simply resolves those offsets against the frost date computed for Yokohama.

The median frost-free season here is 247 days, against 70 to 90 days to maturity for this crop counted from sowing. That margin is what decides whether a late sowing is worth attempting.

See every crop timed for Yokohama →

Nearby

Buckwheat in places close by

Kawasaki 11 km Ōta 15 km Yokosuka 17 km Fujisawa 18 km Yamato 19 km Minamirinkan 20 km

Also in Yokohama

Other grains to time

Soybeans tender Chickpeas half hardy Winter wheat very hardy Quinoa half hardy Cowpeas tender Spring wheat hardy Lentils hardy Mung beans tender Oats hardy Barley hardy Rye very hardy

Growing buckwheat in Yokohama

When should I plant buckwheat in Yokohama?

Aim for 8-22 Apr in an average year. If you would rather not gamble on the weather, wait until 16-30 Apr - by then frost has finished in nine years out of ten.

When will buckwheat be ready to harvest in Yokohama?

Expect to start picking around 17 Jun - 7 Jul, based on 70 to 90 days to maturity from the planting date calculated for this location.

How much frost will buckwheat tolerate?

Killed outright by the lightest frost, which is exactly why it works as a summer cover crop that clears itself away in autumn.