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 way of figuring out when it's possible to plant watermelon is to consult the USDA zone info for Douglas.

Planting Calendar for Watermelon

Frost tolerance for watermelon:	Not tolerant of frost.
When to plant:	After the last frost.

Since watermelon require warm weather you need to wait until after the last frost before you can plant them.

The earliest that you can plant watermelon in Douglas 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 watermelon and expect a good harvest is probably August. Any later than that and your watermelon may not have a chance to really do well. Starting your watermelon indoors is a great way to get them started a few weeks earlier.

Last Frost Date

The average date of last frost is May 15 in Douglas. You should expect an average low temperature of -25°F in the coldest months of winter.

Remember that USDA zone info for Douglas is just an average and the actual date of last frost is different every year. Half of the time in Douglas there is a last frost after May 15 so be sure to be ready to protect your watermelon in the event of a late frost.

USDA Zone Info for Douglas

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 Douglas

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