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

By reviewing the USDA zone info for Tualatin you should be able to determine when it's possible to plant strawflowers.

Planting Calendar for Strawflowers

Frost tolerance for strawflowers:	Tolerant of a very small amount of frost.
When to plant:	Up to 3 weeks before last frost.

Strawflowers do ok in some cold which means that you can plant them slightly earlier in the year than other frost tender plants.

The earliest that you can plant strawflowers in Tualatin is March. However, you really should wait until April if you don't want to take any chances.

The last month that you can plant strawflowers and expect a good harvest is probably August. You probably don't want to wait any later than that or else your strawflowers may not have a chance to really do well. You can get started a little bit earlier by starting your strawflowers indoors.

Last Frost Date

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

Always keep in mind that USDA zone info for Tualatin may not be accurate from year to year and the actual date of last frost is different every year. Since half of the time in Tualatin it frosts late in the year after March 15 be ready to protect your strawflowers in the event of a late frost.

USDA Zone Info for Tualatin

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 Tualatin

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