With Jotform Bronze, will I get 1,000 submissions per month or per year?

I run a non-profit that will be using a registration form on our website January-April. We are expecting about 1800 registrations total. Will the bronze membership support this if there are less than 1,000 each month? 

It's per month. The submissions limit/count will reset to zero on each month, this will happen on the first day at 00 EST. 

If you don't think you'll reach more than 1000 in a month, you can go for our Bronze Plan. Otherwise, you will need to upgrade to our Silver Plan. Silver Plan allows you to receive up to 10, 000 submissions per month. You can downgrade this if you won't be using the paid plan later on.