The USDA Zone info is a great tool for gardeners to help us estimate your gardening schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

You can determine when it's a good idea to plant achimenes in Rockville by reviewing the USDA zone info.

Planting Calendar for Achimenes

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

It's probably a bad idea to plant achimenes until after the last frost because they require warm weather.

The earliest that you can plant achimenes in Rockville 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 achimenes and expect a good harvest is probably August. Any later than that and your achimenes may not have a chance to fully mature. You can get started a couple of weeks earlier by starting your achimenes indoors.

Last Frost Date

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

Since the USDA zone info for Rockville may not be accurate from year to year the actual date of last frost can change quite a bit from year to year. Half of the time in Rockville it frosts late in the year after April 15 so make sure that you are ready to protect your achimenes if you have a late frost.

USDA Zone Info for Rockville

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 Rockville

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