One of the first steps you take when you are estimating your gardening schedule is find your USDA Zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

A way of getting a good idea when it's the best time to plant sweet potatos is to look at the USDA zone info for Beaverton.

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 are not cold tolerant you must wait until after the last frost when the weather gets warmer before you can plant them.

The earliest that you can plant sweet potatos in Beaverton 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. You probably don't want to wait any later than that or else your sweet potatos may not have a chance to grow to maturity. You can get started a little bit earlier by starting your sweet potatos indoors.

Last Frost Date

On average the last frost is on March 15 in Beaverton. It might get as low as 15°F during the coldest months of winter.

It's important to remember that USDA zone info for Beaverton may not be accurate from year to year and the actual date of last frost can change quite a bit from year to year. Half of the time in Beaverton last frost occurs after March 15 so make sure that you are prepared to protect your sweet potatos in the event of one of those late frosts.

USDA Zone Info for Beaverton

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 Beaverton

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