One of the best tools that you have as gardeners to help us determine 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 estimate when it's possible to plant sweet potatos in Scappoose by referring to the USDA zone info.

Planting Calendar for Sweet Potatos

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

Since sweet potatos do not do well in cold weather it is important to wait until after the last frost has passed before you can plant them.

The earliest that you can plant sweet potatos in Scappoose 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 sweet potatos and expect a good harvest is probably August. If you wait any later than that and your sweet potatos may not have a chance to really do well. Starting your sweet potatos indoors is a great way to get them started a couple of weeks earlier.

Last Frost Date

In Scappoose the average date of last frost happens on March 15. You can expect an average low temperature of 15°F in the coldest months of winter.

Keep in mind that the actual date of last frost is just an average because it is based on the USDA zone info for Scappoose and it changes from year to year. Half of the time in Scappoose you get a frost after March 15 so make sure that you are ready to cover your sweet potatos if you have a late frost.

USDA Zone Info for Scappoose

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 Scappoose

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