Question 1

When should I plant spinach in ZIP 19103?

Accepted Answer

In ZIP 19103, the main spinach target is around Mar 13, based on the representative Philadelphia frost station and USDA zone 7b.

Question 2

When should I start spinach seeds indoors in 19103?

Accepted Answer

Spinach is usually direct-sown for ZIP 19103. Use the Mar 13 planting window instead of starting it indoors.

Question 3

When is the last frost in Philadelphia?

Accepted Answer

Philadelphia (ZIP 19103) has an average last spring frost around Apr 10, based on the representative Philadelphia frost station.

Question 4

When is the first frost in Philadelphia?

Accepted Answer

Philadelphia (ZIP 19103) has an average first fall frost around Nov 5, leaving about 209 frost-free days.

Question 5

Is this a guaranteed planting date?

Accepted Answer

No. GrowZone uses frost-date estimates, hardiness zones, and crop timing rules for planning. Local microclimates and current weather can shift the right date.

Spinach is usually direct-sown around Mar 13

Spinach dates for Philadelphia, PA