One of the best tools that you have as gardeners to help us estimate your gardening schedule is the 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.

It's a good idea to estimate when it's a good idea to plant corn by looking at the USDA zone info for Del Rio.

Planting Calendar for Corn

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

You can not plant corn until after the last frost has passed because they are not cold tolerant.

The earliest that you can plant corn in Del Rio is March. However, you really should wait until April if you don't want to take any chances.

The last month that you can plant corn and expect a good harvest is probably September. Any later than that and your corn may not have a chance to really do well. You can get started a couple of weeks earlier by starting your corn indoors.

Last Frost Date

On average the last frost when the weather gets warmer is on February 15 in Del Rio. You should expect an average low temperature of 20°F in the coldest months of winter.

Remember that USDA zone info for Del Rio is just an average and the actual date of last frost can change quite a bit from year to year. Half of the time in Del Rio it frosts late in the year after February 15 so make sure that you are ready to protect your corn if you have one of those late frosts.

USDA Zone Info for Del Rio

Here is the info for USDA Zone 9a.

Average Date of Last Frost (spring)	February 15
Average Date of First Frost (fall)	December 15
Lowest Expected Low	20°F
Highest Expected Low	25°F

This means that on a really cold year, the coldest it will get is 20°F. On most years you should be prepared to experience lows near 25°F.

Plants to Grow in Del Rio

You may be interested in your other planting guides for Del Rio.