When to Plant Tomatos in Monmouth, OR

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.

By checking out the USDA zone info for Monmouth you will be able to figure out when to plant tomatos.


Planting Calendar for Tomatos

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

It's probably not a good idea to plant tomatos until after the last frost has passed because they require warm weather.

JanFebMarAprMayJunJulAugSepOctNovDec
Legend 
A good time to plant tomatos
Possibly ok, but a risky time to plant tomatos
Probably not a good time to plant tomatos

The earliest that you can plant tomatos in Monmouth 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 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 really do well. Starting your tomatos indoors is a great way to get them started a few weeks earlier.

Last Frost Date

The average date of last frost is March 15 in Monmouth. You should expect an average low temperature of 15°F in the coldest months of winter.

Keep in mind that USDA zone info for Monmouth is just an average and the actual date of last frost can change quite a bit from year to year. Since half of the time in Monmouth it frosts late in the year after March 15 be ready to protect your tomatos in the event of a surprise late frost.

USDA Zone Info for Monmouth

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 Low15°F
Highest Expected Low20°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 Monmouth

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