One of the first steps you take when you are estimating your gardening schedule is find your USDA Zone info. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

In Wentzville you can determine when to plant marigold by referring to the USDA zone info.

Planting Calendar for Marigold

Frost tolerance for marigold:	Not tolerant of frost.
When to plant:	After all chance of frost has passed.

It's a bad idea to plant marigold until after the last frost because they are not cold tolerant.

The earliest that you can plant marigold in Wentzville 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 marigold and expect a good harvest is probably August. If you wait any later than that and your marigold may not have a chance to fully mature. You can get started a little bit earlier by starting your marigold indoors.

Last Frost Date

The average date of last frost is April 15 in Wentzville. In the coldest months of winter you can expect an average low temperature of -10°F.

Since the USDA zone info for Wentzville is an average the actual date of last frost changes from year to year. Half of the time in Wentzville you get a frost after April 15 so just be sure to be ready to protect your marigold if you have a surprise late frost.

USDA Zone Info for Wentzville

Here is the info for USDA Zone 6a.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-10°F
Highest Expected Low	-5°F

This means that on a really cold year, the coldest it will get is -10°F. On most years you should be prepared to experience lows near -5°F.

Plants to Grow in Wentzville

You may be interested in your other planting guides for Wentzville.