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Hi KatnRandy, Welcome to GPF. It is probably safer to do the new liner in the fall than the spring. Even though people associate cleaning with spring I think it is safer to do it in the fall. In the spring your fish resistance to disease is usually quite low coming out of the winter. When you change the liner you can keep the beneficial bacteria in your filter alive by adding an airstone to it while the system is down. The bacteria needs moving water to stay alive. You probably want to wait until it is a little cooler and the fish start to slow down. If they are really active it may be tough to keep up with their waste if your pond needs to cycle again. I did a full liner change last summer and made the mistake thinking that there was enough good bacteria in the new pond by using a lot of the same water that it did not need to cycle again. I was wrong! You should check their water regularly with a test kit once you put them in the new pond and do partial water changes if needed. Also consider going bigger and deeper than your plan otherwise you will probably want to enlarge it again next year!