One of the first steps you take when you are figuring out your gardening schedule is find your USDA Zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

The first opportunity to plant blue throatwort in Issaquah should be figured out by reviewing the USDA zone info.

Planting Calendar for Blue Throatwort

Frost tolerance for blue throatwort:	Not tolerant of frost.
When to plant:	After the last frost when the weather gets warmer.

Since blue throatwort require warm weather it is necessary to wait until after the last frost before you can plant them.

The earliest that you can plant blue throatwort in Issaquah is April. However, you really should wait until May if you don't want to take any chances.

The last month that you can plant blue throatwort and expect a good harvest is probably August. If you wait any later than that and your blue throatwort may not have a chance to really do well. You can get started a little bit earlier by starting your blue throatwort indoors.

Last Frost Date

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

Since the USDA zone info for Issaquah may not be accurate from year to year the actual date of last frost can change quite a bit from year to year. Half of the time in Issaquah you get surprised by a frost after March 15 so just be sure to be ready to cover your blue throatwort if you have one of those late frosts.

USDA Zone Info for Issaquah

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 Issaquah

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