Mung bean · Yokohama, Kanagawa, Japan
When to plant mung beans in Yokohama
Main outdoor window
15 Apr - 6 May
The window this page is built around.
Timed from last spring frost
1 April
In Yokohama, on your chosen risk.
Ready to pick
29 Jun - 24 Jul
If you plant at the start of the window.
The average last frost. Half of all years are later than this.
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
15 Apr - 6 May
Two weeks after your last frost.
Harvest
29 Jun - 24 Jul
Mung beans through the year
Against the frost risk in Yokohama
Why these dates
Killed by any frost. Needs roughly 90 warm frost-free days to dry a crop down.
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. Mung beans are timed for direct sowing 2 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 75 to 100 days to maturity for this crop counted from sowing. That margin is what decides whether a late sowing is worth attempting.
Growing mung beans in Yokohama
When should I plant mung beans in Yokohama?
Aim for 15 Apr - 6 May in an average year. If you would rather not gamble on the weather, wait until 23 Apr - 14 May - by then frost has finished in nine years out of ten.
When will mung beans be ready to harvest in Yokohama?
Expect to start picking around 29 Jun - 24 Jul, based on 75 to 100 days to maturity from the planting date calculated for this location.
How much frost will mung beans tolerate?
Killed by any frost. Needs roughly 90 warm frost-free days to dry a crop down.