One of the best tools that you have as gardeners to help us determine your gardening schedule is the USDA zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

The best time to plant iresene in Gaithersburg can be estimated by checking out the USDA zone info.

Planting Calendar for Iresene

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

Since iresene do not do well in cold weather you really should wait until after the last frost has passed before you can plant them.

The earliest that you can plant iresene in Gaithersburg 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 iresene and expect a good harvest is probably August. If you wait any later than that and your iresene may not have a chance to fully mature. You can get started a few weeks earlier by starting your iresene indoors.

Last Frost Date

The average date of last frost is April 15 in Gaithersburg. You can expect an average low temperature of 0°F in the coldest months of winter.

Since the USDA zone info for Gaithersburg is just an average the actual date of last frost changes from year to year. Half of the time in Gaithersburg you get surprised by a frost after April 15 so always be ready to cover your iresene if you have a late frost.

USDA Zone Info for Gaithersburg

Here is the info for USDA Zone 7a.

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

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

Plants to Grow in Gaithersburg

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