One of the first steps you take when you are determining your gardening schedule is find your USDA Zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

One way of estimating when you can plant tomatos is to check out the USDA zone info for Isanti.

Planting Calendar for Tomatos

Frost tolerance for tomatos:	Not tolerant of frost.
When to plant:	After the last frost when the weather gets warmer.

It's not a good idea to plant tomatos until after all chance of frost has passed because they are not cold tolerant.

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

The last month that you can plant tomatos and expect a good harvest is probably August. You probably don't want to wait any later than that or else your tomatos may not have a chance to grow to maturity. You can get started a little bit earlier by starting your tomatos indoors.

Last Frost Date

In Isanti the average date of last frost happens on May 15. In the coldest months of winter you can expect an average low temperature of -30°F.

Remember that USDA zone info for Isanti is an average and the actual date of last frost changes from year to year. Half of the time in Isanti last frost occurs after May 15 so just be sure to be ready to cover your tomatos in the event of one of those late frosts.

USDA Zone Info for Isanti

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 Isanti

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