Dill · Philadelphia, Pennsylvania, United States
When to plant dill in Philadelphia
Main outdoor window
14-24 Apr
The window this page is built around.
Timed from last spring frost
14 April
In Philadelphia, on your chosen risk.
Ready to pick
24 May - 13 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 Philadelphia
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 direct
14-24 Apr
Around your last frost.
Harvest
24 May - 13 Jun
Dill through the year
Against the frost risk in Philadelphia
Why these dates
Sow at the last frost date and again every three weeks. Each plant is short-lived, so succession is the only way to keep leaf coming.
Seedlings handle a light frost. Self-seeds freely and often returns without being asked.
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. Dill are timed for direct sowing 0 weeks after it, and this page simply resolves those offsets against the frost date computed for Philadelphia.
The median frost-free season here is 202 days, against 40 to 60 days to maturity for this crop counted from sowing. That margin is what decides whether a late sowing is worth attempting.
Growing dill in Philadelphia
When should I plant dill in Philadelphia?
Aim for 14-24 Apr in an average year. If you would rather not gamble on the weather, wait until 23 Apr - 3 May - by then frost has finished in nine years out of ten.
When will dill be ready to harvest in Philadelphia?
Expect to start picking around 24 May - 13 Jun, based on 40 to 60 days to maturity from the planting date calculated for this location.
How much frost will dill tolerate?
Seedlings handle a light frost. Self-seeds freely and often returns without being asked.