The USDA Zone info is a great tool for gardeners to help us determine your gardening schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

One way of figuring out when to plant sunflowers is to use the USDA zone info for Havelock.

Planting Calendar for Sunflowers

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

Sunflowers require warm weather which tells us that it is important to wait until it warms up after the last frost before you can plant them.

The earliest that you can plant sunflowers in Havelock 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 sunflowers and expect a good harvest is probably August. If you wait any later than that and your sunflowers may not have a chance to fully mature. If you are starting your sunflowers indoors then you might be able to get away with starting them a few weeks earlier.

Last Frost Date

The average date of last frost is March 15 in Havelock. In the coldest months of winter you can expect an average low temperature of 10°F.

Since the USDA zone info for Havelock is an average the actual date of last frost will vary from year to year. Half of the time in Havelock you get a frost after March 15 so be sure to be ready to cover your sunflowers if you have a surprise late frost.

USDA Zone Info for Havelock

Here is the info for USDA Zone 8a.

Average Date of Last Frost (spring)	March 15
Average Date of First Frost (fall)	November 15
Lowest Expected Low	10°F
Highest Expected Low	15°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 15°F.

Plants to Grow in Havelock

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