In that advanced season, the party soon passed out of the moist, temperate regions of the foothills into the dry, bracing air of the Sierras.

8 seconds sound clip from the The Outcasts of Poker Flat classic radio drama series episode.

You can hear this line at 00:06:06.526 in the radio play.

Quote context

[...]

- Very hard ride for a lady. Ain't no ladies making the trip, but I know.

- Why, you...!

- If you know what's good for you, don't ever show up in Poker Flat again.

- Speaking for myself, I ain't aiming to do that.

- All right, then, don't.

- There's plenty more bows on that old sycamore for any of you that we set eyes on. Now get moving. The lot of you.

- The road to Sandy Bar lay over a steep mountain range.

- In that advanced season, the party soon passed out of the moist, temperate regions of the foothills into the dry, bracing air of the Sierras.

- The trail was narrow and difficult.

- At noon, the Duchess, rolling out of her saddle upon the ground, declared her intention of going no further, and the party halted.

- I ain't a-going another yard. It's plain murder, and I ain't gonna stand for it.

- Okay, ma'am, we'll take a little rest. But we're hardly halfway through the mountains yet.

[...]