One of the first steps you take when you are getting a good idea 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.

You will be able to estimate when to plant iberis by reviewing the USDA zone info for Lowell.

Planting Calendar for Iberis

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

Iberis do ok in some cold which means that you can plant them a little earlier in the year than other frost tender plants.

The earliest that you can plant iberis in Lowell 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 grow to maturity. You can get started a little bit earlier by starting your iberis indoors.

Last Frost Date

On average the last frost has passed is on April 15 in Lowell. In the coldest months of winter you can expect an average low temperature of -15°F.

It's important to remember that USDA zone info for Lowell is just an average and the actual date of last frost will vary from year to year. Half of the time in Lowell you get a frost after April 15 so make sure that you are ready to cover your iberis in the event of one of those late frosts.

USDA Zone Info for Lowell

Here is the info for USDA Zone 5b.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-15°F
Highest Expected Low	-10°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 -10°F.

Plants to Grow in Lowell

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