When can I plant Sweet corn in Zone 4a

Before planting it is a good idea to find our USDA Zone info to determine our garden schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for our area.

A way of getting a good idea when it's the best time to plant sweet corn is to refer to the USDA zone info for Zone 4a.


Planting Calendar for Sweet corn

Frost tolerance for sweet corn: Tolerant of a very small amount of frost.
When you should plant them: Up to 3 weeks before last frost.

Sweet corn do ok in moderate cold which tells us that you can get them planted just a bit earlier than other frost tender plants.

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

The earliest that you can plant sweet corn in Zone 4a is April. However, you really should wait until May if you don't want to take any chances.

The last month that you can plant sweet corn and expect a good harvest is probably August. You probably don't want to wait any later than that or else your sweet corn may not have a chance to fully mature. You can get started a few weeks earlier by starting your sweet corn indoors.

Last Frost Date

On average all chance of frost has passed is on May 15 in Zone 4a. We should expect an average low temperature of -30°F in the coldest months of winter.

Since the USDA zone info for Zone 4a is an average our actual date of last frost changes from year to year. Half of the time in Zone 4a last frost occurs after May 15 so make sure that you are ready to protect your sweet corn if we have a surprise late frost.

USDA Zone Info for Zone 4a

Here is the info for USDA Zone 4a.

Average Date of Last Frost (spring)May 15
Average Date of First Frost (fall)September 15
Lowest Expected Low-30°F
Highest Expected Low-25°F

This means that on a really cold year, the coldest it will get is -30°F. On most years you should be prepared to experience lows near -25°F.

Plants to Grow in Zone 4a

You may be interested in our other planting guides for Zone 4a.