Amaranth · Changwon, Gyeongsangnam-do, South Korea
When to plant amaranth in Changwon
Main outdoor window
18 Mar - 8 Apr
The window this page is built around.
Timed from last spring frost
11 March
In Changwon, on your chosen risk.
Ready to pick
26 Jun - 26 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 Changwon
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.
Start indoors
11 Feb - 4 Mar
Four weeks before your last frost, under cover or on a windowsill.
Sow direct
18 Mar - 8 Apr
One week after your last frost.
Plant out
25 Mar - 15 Apr
Two weeks after your last frost.
Harvest
26 Jun - 26 Jul
Amaranth through the year
Against the frost risk in Changwon
Why these dates
Sow after the last frost into warm soil. The seed is very fine and should barely be covered.
Killed by the first frost at either end of the season - it has no cold tolerance at all.
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. Amaranth are timed from 4 weeks before that frost for an indoor start, with planting out 2 weeks after it, and this page simply resolves those offsets against the frost date computed for Changwon.
The median frost-free season here is 267 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 Changwon
Other grains to time
Growing amaranth in Changwon
When should I plant amaranth in Changwon?
Aim for 18 Mar - 8 Apr in an average year. If you would rather not gamble on the weather, wait until 1-22 Apr - by then frost has finished in nine years out of ten.
When will amaranth be ready to harvest in Changwon?
Expect to start picking around 26 Jun - 26 Jul, based on 100 to 130 days to maturity from the planting date calculated for this location.
How much frost will amaranth tolerate?
Killed by the first frost at either end of the season - it has no cold tolerance at all.