One of the first steps you take when you are determining your gardening schedule is find your 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 looking at the USDA zone info for Stewartville you should be able to estimate when you can plant aubrieta.

Planting Calendar for Aubrieta

Frost tolerance for aubrieta:	Tolerant of some frost.
When to plant:	Up to 5 weeks before last frost.

Aubrieta can survive in mild cold which tells us that you can plant them just a bit earlier in the year than more sensitive plants.

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

Last Frost Date

The average date of last frost is May 15 in Stewartville. You can expect an average low temperature of -25°F in the coldest months of winter.

Since the USDA zone info for Stewartville is just an average the actual date of last frost is different every year. Since half of the time in Stewartville there is a last frost after May 15 be ready to cover your aubrieta in the event of one of those late frosts.

USDA Zone Info for Stewartville

Here is the info for USDA Zone 4b.

Average Date of Last Frost (spring)	May 15
Average Date of First Frost (fall)	September 15
Lowest Expected Low	-25°F
Highest Expected Low	-20°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 -20°F.

Plants to Grow in Stewartville

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