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.

One way of getting a good idea when to plant periwinkles is to look at the USDA zone info for Valley Stream.

Planting Calendar for Periwinkles

Frost tolerance for periwinkles:	Not tolerant of frost.
When to plant:	After all chance of frost has passed.

Since periwinkles do not do well in cold weather it is important to wait until after the last frost has passed before you can plant them.

The earliest that you can plant periwinkles in Valley Stream 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 periwinkles and expect a good harvest is probably August. Any later than that and your periwinkles may not have a chance to fully mature. If you are starting your periwinkles indoors then you might be able to get away with starting them a couple of weeks earlier.

Last Frost Date

On average all chance of frost has passed is on April 15 in Valley Stream. You should expect an average low temperature of 5°F in the coldest months of winter.

Keep in mind that USDA zone info for Valley Stream is just an average and the actual date of last frost can change quite a bit from year to year. Since half of the time in Valley Stream it frosts late in the year after April 15 be ready to cover your periwinkles if you have a late frost.

USDA Zone Info for Valley Stream

Here is the info for USDA Zone 7b.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	5°F
Highest Expected Low	10°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 10°F.

Plants to Grow in Valley Stream

You may be interested in your other planting guides for Valley Stream.