Chervil · Yaroslavl, Yaroslavl Oblast, Russia
When to plant chervil in Yaroslavl
Main outdoor window
19 Apr - 3 May
The window this page is built around.
Timed from last spring frost
8 May
In Yaroslavl, on your chosen risk.
Ready to pick
18 Jun - 8 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 Yaroslavl
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
13 Jun - 4 Jul
Counting back 94 days from your first frost so the crop matures in time.
Sow direct
19 Apr - 3 May
Held back until the soil is warm enough for this crop. The frost date on its own would say 10 Apr, which is too cold for it to start.
Harvest
18 Jun - 8 Jul
Chervil through the year
Against the frost risk in Yaroslavl
Why these dates
Sow direct in succession from four weeks before the last frost, then stop for high summer and resume in late summer. An autumn sowing under cover picks through winter.
Tolerates about -8C and grows through mild winters in a cold frame, which is when it is at its best.
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. Chervil are timed for direct sowing 4 weeks before it, and this page simply resolves those offsets against the frost date computed for Yaroslavl.
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 151 days, against 60 to 80 days to maturity for this crop counted from sowing. That margin is what decides whether a late sowing is worth attempting.
Growing chervil in Yaroslavl
When should I plant chervil in Yaroslavl?
Aim for 19 Apr - 3 May in an average year. If you would rather not gamble on the weather, wait until 24 Apr - 8 May - by then frost has finished in nine years out of ten.
Can I plant chervil earlier in Yaroslavl?
Frost is finished by about 10 Apr, but the soil is still too cold. Chervil will not start until it reaches 5°C (41°F), and here that is around 19 Apr. Going in earlier usually means seed that rots or transplants that sit and sulk, and a later sowing catches them up.
When will chervil be ready to harvest in Yaroslavl?
Expect to start picking around 18 Jun - 8 Jul, based on 60 to 80 days to maturity from the planting date calculated for this location.
How much frost will chervil tolerate?
Tolerates about -8C and grows through mild winters in a cold frame, which is when it is at its best.