Before planting it is a good idea to find your USDA Zone info to determine your garden schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

The USDA zone info for Rock Springs can be used to determine when you can plant angelonia.

Planting Calendar for Angelonia

Frost tolerance for angelonia:	Tolerant of a very small amount of frost.
When to plant:	Up to 3 weeks before last frost.

Since angelonia are barely cold tolerant you can plant them a bit earlier in the year than other frost tender plants.

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

Last Frost Date

In Rock Springs the average date of last frost happens on April 15. You should expect an average low temperature of -20°F in the coldest months of winter.

It's important to remember that USDA zone info for Rock Springs may not be accurate from year to year and the actual date of last frost will vary from year to year. Half of the time in Rock Springs there is a last frost after April 15 so always be ready to protect your angelonia if you have one of those late frosts.

USDA Zone Info for Rock Springs

Here is the info for USDA Zone 5a.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-20°F
Highest Expected Low	-15°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 -15°F.

Plants to Grow in Rock Springs

You may be interested in your other planting guides for Rock Springs.