One of the best tools that you have as gardeners to help us estimate 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 referring to the USDA zone info for Lake Oswego you should be able to figure out when you can plant lunaria.

Planting Calendar for Lunaria

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

You can plant lunaria a little bit earlier in the year because they are one of those plants that can tolerate a little bit of cold weather.

The earliest that you can plant lunaria in Lake Oswego 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 lunaria and expect a good harvest is probably September. You probably don't want to wait any later than that or else your lunaria may not have a chance to fully mature. You can get started a few weeks earlier by starting your lunaria indoors.

Last Frost Date

On average the last frost has passed is on March 15 in Lake Oswego. You should expect an average low temperature of 15°F in the coldest months of winter.

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

USDA Zone Info for Lake Oswego

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 Lake Oswego

You may be interested in your other planting guides for Lake Oswego.