The USDA Zone info is a great tool for gardeners to help us figure out your gardening schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

The best time to plant aubrieta in Marshalltown should be estimated by using the USDA zone info.

Planting Calendar for Aubrieta

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

You can plant aubrieta just a bit earlier in the year because they are moderately cold tolerant.

The earliest that you can plant aubrieta in Marshalltown is February. However, you really should wait until March if you don't want to take any chances.

The last month that you can plant aubrieta and expect a good harvest is probably September. Any later than that and your aubrieta may not have a chance to grow to maturity. You can get started a little bit earlier by starting your aubrieta indoors.

Last Frost Date

On average the last frost is on April 15 in Marshalltown. In the coldest months of winter you can expect an average low temperature of -20°F.

Just be sure to remember that USDA zone info for Marshalltown is not always accurate and the actual date of last frost is different every year. Half of the time in Marshalltown you get a frost after April 15 so make sure that you are ready to cover your aubrieta in the event of a late frost.

USDA Zone Info for Marshalltown

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 Marshalltown

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