The USDA Zone info is a great tool for gardeners to help us figure out your gardening schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

It's a good idea to estimate when it's possible to plant iberis by referring to the USDA zone info for Mount Washington.

Planting Calendar for Iberis

Frost tolerance for iberis:	Tolerant of some frost.
When to plant:	Up to 5 weeks before last frost.

Iberis do well in some cold which tells us that you can plant them a bit earlier in the year than more sensitive plants.

The earliest that you can plant iberis in Mount Washington 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 iberis and expect a good harvest is probably September. Any later than that and your iberis may not have a chance to really do well. You can get started a couple of weeks earlier by starting your iberis indoors.

Last Frost Date

On average all chance of frost has passed is on April 15 in Mount Washington. In the coldest months of winter you should expect an average low temperature of -5°F.

Since the USDA zone info for Mount Washington is an average the actual date of last frost is different every year. Half of the time in Mount Washington it frosts late in the year after April 15 so be sure to be ready to protect your iberis in the event of a late frost.

USDA Zone Info for Mount Washington

Here is the info for USDA Zone 6b.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-5°F
Highest Expected Low	0°F

This means that on a really cold year, the coldest it will get is -5°F. On most years you should be prepared to experience lows near 0°F.

Plants to Grow in Mount Washington

You may be interested in your other planting guides for Mount Washington.