One of the best tools that you have as gardeners to help us figure out your gardening schedule is the USDA zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

A common way of making a decision about when it's possible to plant petunias is to consult the USDA zone info for Pacific.

Planting Calendar for Petunias

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

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

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

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

Last Frost Date

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

It's important to remember that USDA zone info for Pacific is just an average and the actual date of last frost changes from year to year. Since half of the time in Pacific you get a frost after March 15 be ready to protect your petunias if you have one of those late frosts.

USDA Zone Info for Pacific

Here is the info for USDA Zone 8b.

Average Date of Last Frost (spring)	March 15
Average Date of First Frost (fall)	November 15
Lowest Expected Low	15°F
Highest Expected Low	20°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 20°F.

Plants to Grow in Pacific

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