Spring onion · Ryazan’, Ryazan Oblast, Russia
When to plant spring onions in Ryazan’
Main outdoor window
11-25 Apr
The window this page is built around.
Timed from last spring frost
1 May
In Ryazan’, on your chosen risk.
Ready to pick
5-25 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 Ryazan’
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 overwintering
17 Jun - 8 Jul
Counting back 89 days from your first frost so the crop matures in time.
Sow direct
11-25 Apr
Held back until the soil is warm enough for this crop. The frost date on its own would say 3 Apr, which is too cold for it to start.
Harvest
5-25 Jun
Spring onions through the year
Against the frost risk in Ryazan’
Why these dates
Sow direct every three weeks from four weeks before the last frost until about ten weeks before the first. An autumn sowing overwinters for a very early spring crop.
Tolerates about -8C. Autumn sowings survive most temperate winters and stand through cold weather without bolting.
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 onions are timed for direct sowing 4 weeks before it, and this page simply resolves those offsets against the frost date computed for Ryazan’.
With one correction, which is the note at the top of the page: the offset alone would put this crop in soil that is still too cold for it. Where the frost date and the soil temperature disagree, the dates here follow the soil, because a seed in cold ground either rots or waits, and a sowing made a fortnight later usually overtakes it.
The median frost-free season here is 157 days, against 55 to 75 days to maturity for this crop counted from sowing. That margin is what decides whether a late sowing is worth attempting.
Also in Ryazan’
Other vegetables to time
Growing spring onions in Ryazan’
When should I plant spring onions in Ryazan’?
Aim for 11-25 Apr in an average year. If you would rather not gamble on the weather, wait until 20 Apr - 4 May - by then frost has finished in nine years out of ten.
Can I plant spring onions earlier in Ryazan’?
Frost is finished by about 3 Apr, but the soil is still too cold. Spring onions will not start until it reaches 5°C (41°F), and here that is around 11 Apr. Going in earlier usually means seed that rots or transplants that sit and sulk, and a later sowing catches them up.
When will spring onions be ready to harvest in Ryazan’?
Expect to start picking around 5-25 Jun, based on 55 to 75 days to maturity from the planting date calculated for this location.
How much frost will spring onions tolerate?
Tolerates about -8C. Autumn sowings survive most temperate winters and stand through cold weather without bolting.