One of the best tools that you have as gardeners to help us estimate your gardening schedule is the USDA zone info. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

The USDA zone info for Princeton can be reffered to in order to determine when to plant violets.

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 a little bit earlier in the year because they are moderately cold tolerant.

The earliest that you can plant violets in Princeton 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 violets and expect a good harvest is probably August. You probably don't want to wait any later than that or else your violets may not have a chance to fully mature. Starting your violets 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 Princeton. You should expect an average low temperature of -30°F in the coldest months of winter.

Remember that USDA zone info for Princeton is just an average and the actual date of last frost can change quite a bit from year to year. Half of the time in Princeton there is a last frost after May 15 so be sure to be ready to protect your violets if you have a surprise late frost.

USDA Zone Info for Princeton

Here is the info for USDA Zone 4a.

Average Date of Last Frost (spring)	May 15
Average Date of First Frost (fall)	September 15
Lowest Expected Low	-30°F
Highest Expected Low	-25°F

This means that on a really cold year, the coldest it will get is -30°F. On most years you should be prepared to experience lows near -25°F.

Plants to Grow in Princeton

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