Before planting it is a good idea to find your USDA Zone info to figure out your garden schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

The USDA zone info for Woodinville should be used to estimate when it's a good idea to plant liatris.

Planting Calendar for Liatris

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

Liatris are very cold tolerant which tells us that you can get them planted much earlier than other frost tender plants.

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

Last Frost Date

The average date of last frost is March 15 in Woodinville. It might get as low as 15°F during the coldest months of winter.

Remember that the actual date of last frost may not be accurate from year to year because it is based on the USDA zone info for Woodinville and it changes from year to year. Half of the time in Woodinville last frost occurs after March 15 so make sure that you are ready to cover your liatris if you have a late frost.

USDA Zone Info for Woodinville

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 Woodinville

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