The USDA Zone info is a great tool for gardeners to help us determine 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 making a decision about when to plant lisianthus is to look at the USDA zone info for Grants Pass.

Planting Calendar for Lisianthus

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

Since lisianthus require warm weather you must wait until after the last frost when the weather gets warmer before you can plant them.

The earliest that you can plant lisianthus in Grants Pass 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 lisianthus and expect a good harvest is probably August. You probably don't want to wait any later than that or else your lisianthus may not have a chance to fully mature. Starting your lisianthus indoors is a great way to get them started a couple of weeks earlier.

Last Frost Date

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

Since the USDA zone info for Grants Pass is just an average the actual date of last frost is different every year. Half of the time in Grants Pass you get surprised by a frost after March 15 so be sure to be ready to protect your lisianthus if you have one of those late frosts.

USDA Zone Info for Grants Pass

Here is the info for USDA Zone 8b.

Average Date of Last Frost (spring)	March 15
Average Date of First Frost (fall)	October 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 Grants Pass

You may be interested in your other planting guides for Grants Pass.