Planting guide · zone 5b
When to plant zucchini in zone 5b
In zone 5b, the average last spring frost is May 8 and the first fall frost is Oct 8. Here is zucchini's whole year, counted from those dates.
May 15Direct sowSpring
Jun 12Succession sowing 2Spring
J
F
M
A
M
J
J
A
S
O
N
D
Soil & site
A rich, composted mound. Zucchini are hungry and fast.
Seedling care
Direct sow 2 seeds per spot and thin to the strongest.
Growing notes
Squash vine borer is the Southern menace — a second sowing 4 weeks later outruns them. Sawdust-like frass at the stem base is the tell.
Harvest
At 6–8 in, checking daily. They genuinely double overnight.
Same crop, other zones
Zucchini in zone 5a →Zucchini in zone 6a →Zucchini in zone 6b →Zucchini in zone 7a →