Before planting it is a good idea to find your USDA Zone info to determine your garden schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

In Hillsboro you can figure out when it's a good idea to plant violets by referring to the USDA zone info.

Planting Calendar for Violets

Frost tolerance for violets:	Tolerant of some frost.
When to plant:	Up to 5 weeks before last frost.

You can plant violets just a bit earlier in the year because they are moderately cold tolerant.

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

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

Last Frost Date

On average all chance of frost has passed is on April 15 in Hillsboro. It might get as low as -10°F during the coldest months of winter.

Always keep in mind that USDA zone info for Hillsboro is not always accurate and the actual date of last frost can change quite a bit from year to year. Since half of the time in Hillsboro you get surprised by a frost after April 15 be ready to cover your violets if you have a surprise late frost.

USDA Zone Info for Hillsboro

Here is the info for USDA Zone 6a.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-10°F
Highest Expected Low	-5°F

This means that on a really cold year, the coldest it will get is -10°F. On most years you should be prepared to experience lows near -5°F.

Plants to Grow in Hillsboro

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