The USDA Zone info is a great tool for gardeners to help us determine your gardening schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

A common way of determining when you can plant browallia is to refer to the USDA zone info for Vernal.

Planting Calendar for Browallia

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

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

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

Last Frost Date

On average all chance of frost has passed is on April 15 in Vernal. You can expect an average low temperature of -15°F in the coldest months of winter.

Since the USDA zone info for Vernal is not always accurate the actual date of last frost is different every year. Since half of the time in Vernal it frosts late in the year after April 15 be ready to protect your browallia if you have one of those late frosts.

USDA Zone Info for Vernal

Here is the info for USDA Zone 5b.

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

This means that on a really cold year, the coldest it will get is -15°F. On most years you should be prepared to experience lows near -10°F.

Plants to Grow in Vernal

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