One of the best tools that you have as gardeners to help us figure out your gardening schedule is the USDA zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

By reviewing the USDA zone info for Lewistown you will be able to figure out when it's the best time to plant aubrieta.

Planting Calendar for Aubrieta

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

Since aubrieta do well in moderate cold you can plant them a little earlier in the year than other plants that might not handle the cold.

The earliest that you can plant aubrieta in Lewistown 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

On average the last frost is on May 15 in Lewistown. You can expect an average low temperature of -30°F in the coldest months of winter.

Keep in mind that USDA zone info for Lewistown is not always accurate and the actual date of last frost will vary from year to year. Since half of the time in Lewistown it frosts late in the year after May 15 be ready to protect your aubrieta in the event of a late frost.

USDA Zone Info for Lewistown

Here is the info for USDA Zone 4a.

Average Date of Last Frost (spring)	May 15
Average Date of First Frost (fall)	September 15
Lowest Expected Low	-30°F
Highest Expected Low	-25°F

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

Plants to Grow in Lewistown

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