One of the best tools that you have as gardeners to help us figure out your gardening schedule is the USDA zone info. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

A way of getting a good idea when it's the best time to plant oleander is to use the USDA zone info for New Haven.

Planting Calendar for Oleander

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

You really shouldn't plant oleander until after the last frost when the weather gets warmer because they are not cold tolerant.

The earliest that you can plant oleander in New Haven 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 oleander and expect a good harvest is probably August. You probably don't want to wait any later than that or else your oleander may not have a chance to fully mature. You can get started a little bit earlier by starting your oleander indoors.

Last Frost Date

The average date of last frost is April 15 in New Haven. You can expect an average low temperature of -10°F in the coldest months of winter.

Just be sure to remember that USDA zone info for New Haven may not be accurate from year to year and the actual date of last frost is different every year. Since half of the time in New Haven you get surprised by a frost after April 15 be ready to cover your oleander if you have a late frost.

USDA Zone Info for New Haven

Here is the info for USDA Zone 6a.

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

This means that on a really cold year, the coldest it will get is -10°F. On most years you should be prepared to experience lows near -5°F.

Plants to Grow in New Haven

You may be interested in your other planting guides for New Haven.