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 Tualatin you can determine when it's a good idea to plant aubrieta by reviewing 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 one of those plants that can tolerate a little bit of cold weather you can plant them a little bit earlier in the year than other frost tender plants.

The earliest that you can plant aubrieta in Tualatin 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 couple of weeks earlier by starting your aubrieta indoors.

Last Frost Date

On average the last frost has passed is on March 15 in Tualatin. In the coldest months of winter you can expect an average low temperature of 15°F.

Remember that USDA zone info for Tualatin is not always accurate and the actual date of last frost will vary from year to year. Since half of the time in Tualatin you get surprised by a frost after March 15 be ready to protect your aubrieta if you have one of those late frosts.

USDA Zone Info for Tualatin

Here is the info for USDA Zone 8b.

Average Date of Last Frost (spring)	March 15
Average Date of First Frost (fall)	November 15
Lowest Expected Low	15°F
Highest Expected Low	20°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 20°F.

Plants to Grow in Tualatin

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