The USDA Zone info is a great tool for gardeners to help us figure out your gardening schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

You should be able to determine when you can plant impatiens by reviewing the USDA zone info for Mountlake Terrace.

Planting Calendar for Impatiens

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

You should not plant impatiens until after the last frost because they do not do well in cold weather.

The earliest that you can plant impatiens in Mountlake Terrace 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 impatiens and expect a good harvest is probably August. Any later than that and your impatiens may not have a chance to fully mature. You can get started a few weeks earlier by starting your impatiens indoors.

Last Frost Date

On average the last frost is on March 15 in Mountlake Terrace. You can expect an average low temperature of 15°F in the coldest months of winter.

Since the USDA zone info for Mountlake Terrace is not always accurate the actual date of last frost will vary from year to year. Half of the time in Mountlake Terrace last frost occurs after March 15 so always be ready to protect your impatiens in the event of a late frost.

USDA Zone Info for Mountlake Terrace

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 Mountlake Terrace

You may be interested in your other planting guides for Mountlake Terrace.