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.

The USDA zone info for Norfolk should be reffered to in order to estimate when it's a good idea to plant trifolium.

Planting Calendar for Trifolium

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

You can plant trifolium a bit earlier in the year because they are barely cold tolerant.

The earliest that you can plant trifolium in Norfolk 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 trifolium and expect a good harvest is probably August. You probably don't want to wait any later than that or else your trifolium may not have a chance to really do well. You can get started a couple of weeks earlier by starting your trifolium indoors.

Last Frost Date

The average date of last frost is April 15 in Norfolk. You can expect an average low temperature of -20°F in the coldest months of winter.

Since the USDA zone info for Norfolk may not be accurate from year to year the actual date of last frost will vary from year to year. Since half of the time in Norfolk last frost occurs after April 15 be ready to cover your trifolium in the event of a surprise late frost.

USDA Zone Info for Norfolk

Here is the info for USDA Zone 5a.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-20°F
Highest Expected Low	-15°F

This means that on a really cold year, the coldest it will get is -20°F. On most years you should be prepared to experience lows near -15°F.

Plants to Grow in Norfolk

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