One of the best tools that you have as gardeners to help us estimate 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.

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

Planting Calendar for Stoneseed

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

It's probably not a good idea to plant stoneseed until after the last frost when the weather gets warmer because they require warm weather.

The earliest that you can plant stoneseed in Worthington is May. However, you really should wait until June if you don't want to take any chances.

The last month that you can plant stoneseed and expect a good harvest is probably August. If you wait any later than that and your stoneseed may not have a chance to fully mature. You can get started a little bit earlier by starting your stoneseed indoors.

Last Frost Date

On average the last frost is on May 15 in Worthington. It might get as low as -25°F during the coldest months of winter.

Since the USDA zone info for Worthington is just an average the actual date of last frost will vary from year to year. Since half of the time in Worthington there is a last frost after May 15 be ready to protect your stoneseed if you have a late frost.

USDA Zone Info for Worthington

Here is the info for USDA Zone 4b.

Average Date of Last Frost (spring)	May 15
Average Date of First Frost (fall)	September 15
Lowest Expected Low	-25°F
Highest Expected Low	-20°F

This means that on a really cold year, the coldest it will get is -25°F. On most years you should be prepared to experience lows near -20°F.

Plants to Grow in Worthington

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