Oats · Changning, Shanghai, China
When to plant oats in Changning
Main outdoor window
2-23 Feb
The window this page is built around.
Timed from last spring frost
2 March
In Changning, on your chosen risk.
Ready to pick
13 May - 12 Jun
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 Changning
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 for autumn
1-22 Jul
Counting back 144 days from your first frost so the crop matures in time.
Sow direct
2-23 Feb
Four weeks before your last frost.
Harvest
13 May - 12 Jun
Oats through the year
Against the frost risk in Changning
Why these dates
Sow very early in spring for grain. Sown in late summer instead, oats make excellent ground cover that winter-kills cleanly and leaves an easy seedbed in spring.
Seedlings take -7C. Oats sown as a cover crop are deliberately killed by frost around -8C, which is the point - the residue mulches the bed without needing removal.
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. Oats are timed for direct sowing 4 weeks before it, and this page simply resolves those offsets against the frost date computed for Changning.
The median frost-free season here is 287 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.
Also in Changning
Other grains to time
Growing oats in Changning
When should I plant oats in Changning?
Aim for 2-23 Feb in an average year. If you would rather not gamble on the weather, wait until 14 Feb - 7 Mar - by then frost has finished in nine years out of ten.
When will oats be ready to harvest in Changning?
Expect to start picking around 13 May - 12 Jun, based on 100 to 130 days to maturity from the planting date calculated for this location.
How much frost will oats tolerate?
Seedlings take -7C. Oats sown as a cover crop are deliberately killed by frost around -8C, which is the point - the residue mulches the bed without needing removal.