One of the first steps you take when you are determining your gardening schedule is find your USDA Zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

In Rio Grande City you can figure out when it's a good idea to plant impatiens by reviewing the USDA zone info.

Planting Calendar for Impatiens

Frost tolerance for impatiens:	Not tolerant of frost.
When to plant:	After the last frost.

It's probably a bad idea to plant impatiens until after the last frost when the weather gets warmer because they do not do well in cold weather.

The earliest that you can plant impatiens in Rio Grande City 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 impatiens and expect a good harvest is probably September. Any later than that and your impatiens may not have a chance to fully mature. You can get started a couple of weeks earlier by starting your impatiens indoors.

Last Frost Date

The average date of last frost is February 15 in Rio Grande City. In the coldest months of winter you can expect an average low temperature of 25°F.

Since the USDA zone info for Rio Grande City may not be accurate from year to year the actual date of last frost is different every year. Half of the time in Rio Grande City you get a frost after February 15 so make sure that you are prepared to protect your impatiens if you have a late frost.

USDA Zone Info for Rio Grande City

Here is the info for USDA Zone 9b.

Average Date of Last Frost (spring)	February 15
Average Date of First Frost (fall)	December 15
Lowest Expected Low	25°F
Highest Expected Low	30°F

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

Plants to Grow in Rio Grande City

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