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.

A common way of determining when to plant sunflowers is to use the USDA zone info for Jasper.

Planting Calendar for Sunflowers

Frost tolerance for sunflowers:	Not tolerant of frost.
When to plant:	After the last frost when the weather gets warmer.

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

The earliest that you can plant sunflowers in Jasper 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. Any later than that and your sunflowers may not have a chance to really do well. You can get started a couple of weeks earlier by starting your sunflowers indoors.

Last Frost Date

On average all chance of frost has passed is on March 15 in Jasper. In the coldest months of winter you can expect an average low temperature of 15°F.

Since the USDA zone info for Jasper is not always accurate the actual date of last frost can change quite a bit from year to year. Since half of the time in Jasper last frost occurs after March 15 be ready to cover your sunflowers if you have one of those late frosts.

USDA Zone Info for Jasper

Here is the info for USDA Zone 8b.

Average Date of Last Frost (spring)	March 15
Average Date of First Frost (fall)	November 15
Lowest Expected Low	15°F
Highest Expected Low	20°F

This means that on a really cold year, the coldest it will get is 15°F. On most years you should be prepared to experience lows near 20°F.

Plants to Grow in Jasper

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