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

A way of figuring out when it's a good idea to plant garlic is to refer to the USDA zone info for Portland.

Planting Calendar for Garlic

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

You can plant garlic earlier in the year because they do well in cold.

The earliest that you can plant garlic in Portland 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 garlic and expect a good harvest is probably September. You probably don't want to wait any later than that or else your garlic may not have a chance to fully mature. You can get started a couple of weeks earlier by starting your garlic indoors.

Last Frost Date

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

Always keep in mind that USDA zone info for Portland is not always accurate and the actual date of last frost changes from year to year. Half of the time in Portland you get a frost after April 15 so make sure that you are ready to protect your garlic if you have a late frost.

USDA Zone Info for Portland

Here is the info for USDA Zone 5b.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-15°F
Highest Expected Low	-10°F

This means that on a really cold year, the coldest it will get is -15°F. On most years you should be prepared to experience lows near -10°F.

Plants to Grow in Portland

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