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

In Lancaster you can figure out when it's possible to plant rosemary by using the USDA zone info.

Planting Calendar for Rosemary

Frost tolerance for rosemary:	Very tolerant of frost.
When to plant:	Up to 7 weeks before last frost.

Rosemary are one of those plants that can tolerate quite a bit of cold weather which means that you can plant them much earlier than other frost tender plants.

The earliest that you can plant rosemary in Lancaster 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 rosemary and expect a good harvest is probably September. Any later than that and your rosemary may not have a chance to really do well. You can get started a few weeks earlier by starting your rosemary indoors.

Last Frost Date

On average the last frost has passed is on March 15 in Lancaster. In the coldest months of winter you should expect an average low temperature of 10°F.

Remember that USDA zone info for Lancaster 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 Lancaster last frost occurs after March 15 be ready to protect your rosemary if you have one of those late frosts.

USDA Zone Info for Lancaster

Here is the info for USDA Zone 8a.

Average Date of Last Frost (spring)	March 15
Average Date of First Frost (fall)	November 15
Lowest Expected Low	10°F
Highest Expected Low	15°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 15°F.

Plants to Grow in Lancaster

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