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.

In Ridgefield you can figure out when it's possible to plant onions by looking at the USDA zone info.

Planting Calendar for Onions

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

Since onions do well in cold you can plant them much earlier in the year than other plants that might not handle the cold.

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

Last Frost Date

On average all chance of frost has passed is on April 15 in Ridgefield. It might get as low as 0°F during the coldest months of winter.

Remember that USDA zone info for Ridgefield is just an average and the actual date of last frost can change quite a bit from year to year. Half of the time in Ridgefield it frosts late in the year after April 15 so make sure that you are prepared to protect your onions in the event of one of those late frosts.

USDA Zone Info for Ridgefield

Here is the info for USDA Zone 7a.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	0°F
Highest Expected Low	5°F

This means that on a really cold year, the coldest it will get is 0°F. On most years you should be prepared to experience lows near 5°F.

Plants to Grow in Ridgefield

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