Spring wheat · Tanggu, Tianjin, China
When to plant spring wheat in Tanggu
Main outdoor window
10-31 Mar
The window this page is built around.
Timed from last spring frost
31 March
In Tanggu, on your chosen risk.
Ready to pick
18 Jun - 18 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 Tanggu
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
10-31 Mar
Three weeks before your last frost.
Harvest
18 Jun - 18 Jul
Spring wheat through the year
Against the frost risk in Tanggu
Why these dates
Sow as early as the ground can be worked, roughly three weeks before the last frost. The seedlings tolerate frost easily; what they cannot tolerate is heat during grain fill, so an early sowing is a hedge against a hot midsummer.
Seedlings survive to about -6C. The vulnerable stage is flowering, where a frost causes blank heads that look normal until threshing.
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. Spring wheat are timed for direct sowing 3 weeks before it, and this page simply resolves those offsets against the frost date computed for Tanggu.
The median frost-free season here is 221 days, against 100 to 130 days to maturity for this crop counted from sowing. That margin is what decides whether a late sowing is worth attempting.
Growing spring wheat in Tanggu
When should I plant spring wheat in Tanggu?
Aim for 10-31 Mar in an average year. If you would rather not gamble on the weather, wait until 21 Mar - 11 Apr - by then frost has finished in nine years out of ten.
When will spring wheat be ready to harvest in Tanggu?
Expect to start picking around 18 Jun - 18 Jul, based on 100 to 130 days to maturity from the planting date calculated for this location.
How much frost will spring wheat tolerate?
Seedlings survive to about -6C. The vulnerable stage is flowering, where a frost causes blank heads that look normal until threshing.