One of the first steps you take when you are estimating your gardening schedule is find your 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.

A common way of getting a good idea when it's the best time to plant impatiens is to consult the USDA zone info for Williams.

Planting Calendar for Impatiens

Frost tolerance for impatiens:	Not tolerant of frost.
When to plant:	After the last frost has passed.

Since impatiens require warm weather it's necessary to wait until after all chance of frost has passed before you can plant them.

The earliest that you can plant impatiens in Williams is March. However, you really should wait until April if you don't want to take any chances.

The last month that you can plant impatiens and expect a good harvest is probably September. If you wait 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 when the weather gets warmer is on February 15 in Williams. In the coldest months of winter you should expect an average low temperature of 25°F.

Since the USDA zone info for Williams is not always accurate the actual date of last frost can change quite a bit from year to year. Since half of the time in Williams you get surprised by a frost after February 15 be ready to protect your impatiens in the event of a surprise late frost.

USDA Zone Info for Williams

Here is the info for USDA Zone 9b.

Average Date of Last Frost (spring)	February 15
Average Date of First Frost (fall)	December 15
Lowest Expected Low	25°F
Highest Expected Low	30°F

This means that on a really cold year, the coldest it will get is 25°F. On most years you should be prepared to experience lows near 30°F.

Plants to Grow in Williams

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