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

In Delafield you can estimate when it's the best time to plant basil by reviewing the USDA zone info.

Planting Calendar for Basil

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

Since basil do not do well in cold weather you must wait until after the last frost before you can plant them.

The earliest that you can plant basil in Delafield 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 basil and expect a good harvest is probably August. If you wait any later than that and your basil may not have a chance to fully mature. Starting your basil indoors is a great way to get them started a few weeks earlier.

Last Frost Date

The average date of last frost is April 15 in Delafield. In the coldest months of winter you should expect an average low temperature of -20°F.

It's important to remember that USDA zone info for Delafield is just an average and the actual date of last frost is different every year. Half of the time in Delafield it frosts late in the year after April 15 so be sure to be ready to protect your basil in the event of one of those late frosts.

USDA Zone Info for Delafield

Here is the info for USDA Zone 5a.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-20°F
Highest Expected Low	-15°F

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

Plants to Grow in Delafield

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