Is my leaf close to mature enough?

[Idaho Mike]

Up here in North Idaho we are getting into the rainy season. This test crop was planted a little late, and I’m worried the rain and cooler temps may affect the plant leaves ability to ripen. I’m wondering if I should wait, or begin picking some of the larger lower leaves. One plant has begun showing some color changes on a couple of leaves.
I’m new to growing. Any advice is welcome.

 

[deluxestogie]

They all look fairly immature to me, from the photos. Rain and cool (not frost) may slow maturation some. But harvesting immature leaf is a futile endeavor. You can prime a leaf when the very tip shows some yellow--any yellow. You probably need another two or three weeks (frost-free) to see most of the plant maturing.

If a frost is predicted while you wait, harvest all the lower leaf, and just take your chances with its color-curing adequately. Frosted leaf turns out to be predictably horrid.

Bob

EDIT: The yellow in the 3rd/4th photo appears on leaf that is above leaf that has not matured, so I'm suspicious.

 

[Charly]

The yellow in the 3rd/4th photo appears on leaf that is above leaf that has not matured, so I'm suspicious.

I agree, those leaves from the top are showing some discoloration (probably caused by a deficiency or a disease), they are not mature in my opinion.
Wait and if the weather becomes too cold you can try to stalk curing them in a freeze-free area.