One of the best tools that you have as gardeners to help us figure out 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.

By using the USDA zone info for Uvalde you should be able to determine when it's possible to plant sunflowers.

Planting Calendar for Sunflowers

Frost tolerance for sunflowers:	Not tolerant of frost.
When to plant:	After the last frost has passed.

It's probably a bad idea to plant sunflowers until after the last frost has passed because they require warm weather.

The earliest that you can plant sunflowers in Uvalde 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 sunflowers and expect a good harvest is probably September. Any later than that and your sunflowers may not have a chance to grow to maturity. Starting your sunflowers indoors is a great way to get them started a couple of weeks earlier.

Last Frost Date

In Uvalde the average date of last frost happens on February 15. In the coldest months of winter you can expect an average low temperature of 20°F.

Remember that USDA zone info for Uvalde is an average and the actual date of last frost changes from year to year. Half of the time in Uvalde there is a last frost after February 15 so make sure that you are ready to protect your sunflowers in the event of a late frost.

USDA Zone Info for Uvalde

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 Uvalde

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