One of the best tools that you have as gardeners to help us determine your gardening schedule is the 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 reviewing the USDA zone info for Oregon you will be able to figure out when it's possible to plant aubretia.

Planting Calendar for Aubretia

Frost tolerance for aubretia:	Very tolerant of frost.
When to plant:	Up to 7 weeks before last frost.

Aubretia are very cold tolerant which means that you can start planting them much earlier than more sensitive plants.

The earliest that you can plant aubretia in Oregon 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 aubretia and expect a good harvest is probably September. Any later than that and your aubretia may not have a chance to really do well. You can get started a couple of weeks earlier by starting your aubretia indoors.

Last Frost Date

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

Since the USDA zone info for Oregon is not always accurate the actual date of last frost will vary from year to year. Since half of the time in Oregon it frosts late in the year after April 15 be ready to cover your aubretia if you have a late frost.

USDA Zone Info for Oregon

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 Oregon

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