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

In Waterloo you can figure out when to plant aubrieta by looking at 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.

Since aubrieta are moderately cold tolerant you can plant them just a bit earlier in the year than more sensitive plants.

The earliest that you can plant aubrieta in Waterloo 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. You probably don't want to wait any later than that or else your aubrieta may not have a chance to really do well. If you are starting your aubrieta indoors then you might be able to get away with starting them a couple of weeks earlier.

Last Frost Date

On average the last frost has passed is on April 15 in Waterloo. It might get as low as -5°F during the coldest months of winter.

Since the USDA zone info for Waterloo is an average the actual date of last frost is different every year. Half of the time in Waterloo last frost occurs after April 15 so always be ready to protect your aubrieta in the event of a late frost.

USDA Zone Info for Waterloo

Here is the info for USDA Zone 6b.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-5°F
Highest Expected Low	0°F

This means that on a really cold year, the coldest it will get is -5°F. On most years you should be prepared to experience lows near 0°F.

Plants to Grow in Waterloo

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