FrostCal

When to Plant Zucchini in Idaho

In a typical Idaho location, start seeds indoors Apr 9 – Apr 16, then sow outdoors May 7 – May 21, then transplant outdoors May 7 – May 14. Across the state, the outdoor planting window starts as early as Apr 13 in Lewiston and as late as May 24 in Eagle. 2 cities in Idaho are essentially frost-free and can plant on a year-round schedule.

Method Direct sow
Days to maturity 45–55 days

Fast-growing squash; direct sow 1-3 weeks after last frost, or start indoors 2-3 weeks early for a head start.

Zucchini Planting Dates by City

CityStart indoorsDirect sowTransplant
BoiseApr 3 – Apr 10May 1 – May 15May 1 – May 8
MeridianApr 3 – Apr 10May 1 – May 15May 1 – May 8
NampaApr 8 – Apr 15May 6 – May 20May 6 – May 13
Idaho FallsApr 18 – Apr 25May 16 – May 30May 16 – May 23
PocatelloApr 11 – Apr 18May 9 – May 23May 9 – May 16
CaldwellApr 2 – Apr 9Apr 30 – May 14Apr 30 – May 7
Coeur d'AleneApr 1 – Apr 8Apr 29 – May 13Apr 29 – May 6
Twin FallsApr 9 – Apr 16May 7 – May 21May 7 – May 14
LewistonMar 16 – Mar 23Apr 13 – Apr 27Apr 13 – Apr 20
Lewiston OrchardsMar 16 – Mar 23Apr 13 – Apr 27Apr 13 – Apr 20
Post FallsApr 1 – Apr 8Apr 29 – May 13Apr 29 – May 6
RexburgApr 24 – May 1May 22 – Jun 5May 22 – May 29
MoscowFrost-free: year-round planting
EagleApr 26 – May 3May 24 – Jun 7May 24 – May 31
CondaFrost-free: year-round planting
KunaApr 3 – Apr 10May 1 – May 15May 1 – May 8
AmmonApr 18 – Apr 25May 16 – May 30May 16 – May 23
ChubbuckApr 11 – Apr 18May 9 – May 23May 9 – May 16
HaydenApr 1 – Apr 8Apr 29 – May 13Apr 29 – May 6
Mountain HomeApr 11 – Apr 18May 9 – May 23May 9 – May 16
BlackfootApr 14 – Apr 21May 12 – May 26May 12 – May 19
Garden CityApr 3 – Apr 10May 1 – May 15May 1 – May 8
JeromeApr 11 – Apr 18May 9 – May 23May 9 – May 16
BurleyApr 16 – Apr 23May 14 – May 28May 14 – May 21

Showing the 24 most populous of 24 Idaho cities. Dates are estimates from each city's NOAA frost normals and university extension timing guidelines. See all Idaho cities.

Frequently Asked Questions

When should I plant zucchini in Idaho?

In a typical Idaho location, start seeds indoors Apr 9 – Apr 16, then sow outdoors May 7 – May 21, then transplant outdoors May 7 – May 14. Across the state, the outdoor planting window starts as early as Apr 13 in Lewiston and as late as May 24 in Eagle. 2 cities in Idaho are essentially frost-free and can plant on a year-round schedule.

When is the last frost in Idaho?

The average last spring frost in Idaho ranges from April 6 in Lewiston to May 17 in Eagle, based on NOAA 1991–2020 climate normals.

How long do zucchini take to grow?

Zucchini typically take 45–55 days from planting to harvest. Fast-growing squash; direct sow 1-3 weeks after last frost, or start indoors 2-3 weeks early for a head start.

Other Crops in Idaho

When to plant zucchini in other states

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