Rent online
Rent your spot online, you only have to pay for the first night...that way you are sure one is available...then the next morning you just go into the office and get your passes and pay for the rest of your stay. Also call the park the day of arrival and they will give you gate codes so you can get in.
I know you can rent a spot online
I rented a shelter.. got there late . They came by in the AM and were nice as can be. They gave us instructions.
Most of the Texas state parks I have been to all work the same. Gates close at 10 pm. If you are in before 10 pm but after the office has closed you can set up and pay in the morning (typically they want you to come and pay before 9 am). If you are there after 10 pm you will be locked out, but there is always a gate code to get in so if you called ahead you might be able to get the code. Either way I would call ahead and confirm with an actual employee. Martin Creek is a beautiful park though, clean restrooms, very well maintained compared to some parks I've camped at. But be warned. There was a lot of poison ivy around the campsites growing up the trees.
We came in at 1am and set up payed next day
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