When can I plant Squash in Zone 3b

The USDA Zone info is a great tool for gardeners to help us figure out our gardening schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for our area.

A common way of figuring out when it's a good idea to plant squash is to consult the USDA zone info for Zone 3b.


Planting Calendar for Squash

Frost tolerance for squash: Not tolerant of frost.
When you should plant them: After the last frost when the weather gets warmer.

It's probably not a good idea to plant squash until after the last frost because they are not cold tolerant.

JanFebMarAprMayJunJulAugSepOctNovDec
Legend 
A good time to plant squash
Possibly ok, but a risky time to plant squash
Probably not a good time to plant squash

The earliest that you can plant squash in Zone 3b is May. However, you really should wait until June if you don't want to take any chances.

The last month that you can plant squash and expect a good harvest is probably August. You probably don't want to wait any later than that or else your squash may not have a chance to really do well. You can get started a little bit earlier by starting your squash indoors.

Last Frost Date

The average date of last frost is May 15 in Zone 3b. In the coldest months of winter we should expect an average low temperature of -35°F.

Remember that our actual date of last frost may not be accurate from year to year because it is based on the USDA zone info for Zone 3b and it changes from year to year. Since half of the time in Zone 3b it frosts late in the year after May 15 be ready to cover your squash if we have one of those late frosts.

USDA Zone Info for Zone 3b

Here is the info for USDA Zone 3b.

Average Date of Last Frost (spring)May 15
Average Date of First Frost (fall)September 15
Lowest Expected Low-35°F
Highest Expected Low-30°F

This means that on a really cold year, the coldest it will get is -35°F. On most years you should be prepared to experience lows near -30°F.

Plants to Grow in Zone 3b

You may be interested in our other planting guides for Zone 3b.