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.

A way of estimating when it's a good idea to plant impatiens is to examine the USDA zone info for Monmouth.

Planting Calendar for Impatiens

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

Since impatiens are not cold tolerant you must wait until after all chance of frost has passed before you can plant them.

The earliest that you can plant impatiens in Monmouth 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. If you wait any later than that and your impatiens may not have a chance to really do well. If you are starting your impatiens indoors then you might be able to get away with starting them a few weeks earlier.

Last Frost Date

In Monmouth the average date of last frost happens on March 15. It might get as low as 15°F during the coldest months of winter.

Just be sure to remember that USDA zone info for Monmouth is an average and the actual date of last frost will vary from year to year. Half of the time in Monmouth last frost occurs after March 15 so just be sure to be ready to cover your impatiens if you have a surprise late frost.

USDA Zone Info for Monmouth

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 Monmouth

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