The USDA Zone info is a great tool for gardeners to help us estimate your gardening schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

It's a good idea to estimate when to plant bacopa by using the USDA zone info for Watertown.

Planting Calendar for Bacopa

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

Since bacopa do ok in moderate cold you can plant them a bit earlier in the year than plants that are more sensitive to the cold.

The earliest that you can plant bacopa in Watertown is April. However, you really should wait until May if you don't want to take any chances.

The last month that you can plant bacopa and expect a good harvest is probably August. If you wait any later than that and your bacopa may not have a chance to fully mature. If you are starting your bacopa indoors then you might be able to get away with starting them a few weeks earlier.

Last Frost Date

On average the last frost has passed is on May 15 in Watertown. It might get as low as -25°F during the coldest months of winter.

It's important to remember that USDA zone info for Watertown is an average and the actual date of last frost changes from year to year. Half of the time in Watertown it frosts late in the year after May 15 so just be sure to be ready to protect your bacopa if you have one of those late frosts.

USDA Zone Info for Watertown

Here is the info for USDA Zone 4b.

Average Date of Last Frost (spring)	May 15
Average Date of First Frost (fall)	September 15
Lowest Expected Low	-25°F
Highest Expected Low	-20°F

This means that on a really cold year, the coldest it will get is -25°F. On most years you should be prepared to experience lows near -20°F.

Plants to Grow in Watertown

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