Zinnia · Bole, Xinjiang, China
When to sow zinnias in Bole
Main outdoor window
10-24 May
The window this page is built around.
Timed from last spring frost
3 May
In Bole, on your chosen risk.
Ready to pick
9-29 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 Bole
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
5-19 Apr
Four weeks before your last frost, under cover or on a windowsill.
Sow direct
10-24 May
One week after your last frost.
Plant out
10-24 May
One week after your last frost.
In flower
9-29 Jul
Zinnias through the year
Against the frost risk in Bole
Why these dates
Direct sowing after last frost usually beats transplanting - zinnias dislike root disturbance and catch up quickly.
Killed by the first frost at either end of the season. Strictly a warm-season flower.
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. Zinnias are timed from 4 weeks before that frost for an indoor start, with planting out 1 weeks after it, and this page simply resolves those offsets against the frost date computed for Bole.
The median frost-free season here is 150 days, against 60 to 80 days to first flower for this crop counted from sowing. That margin is what decides whether a late sowing is worth attempting.
Also in Bole
Other flowers to time
Growing zinnias in Bole
When should I plant zinnias in Bole?
Aim for 10-24 May in an average year. If you would rather not gamble on the weather, wait until 25 May - 8 Jun - by then frost has finished in nine years out of ten.
When will zinnias be ready to harvest in Bole?
Expect to start picking around 9-29 Jul, based on 60 to 80 days to maturity from the planting date calculated for this location.
How much frost will zinnias tolerate?
Killed by the first frost at either end of the season. Strictly a warm-season flower.