One of the first steps you take when you are making a decision about your gardening schedule is find your 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.

It's possible to estimate when it's a good idea to plant arabis by using the USDA zone info for Johnstown.

Planting Calendar for Arabis

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

Since arabis are very cold tolerant you can plant them quite a bit earlier in the year than other plants that might not handle the cold.

The earliest that you can plant arabis in Johnstown 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 arabis and expect a good harvest is probably September. If you wait any later than that and your arabis may not have a chance to grow to maturity. You can get started a few weeks earlier by starting your arabis indoors.

Last Frost Date

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

Since the USDA zone info for Johnstown 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 Johnstown last frost occurs after April 15 be ready to protect your arabis in the event of a surprise late frost.

USDA Zone Info for Johnstown

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 Johnstown

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