Many vegetables provide large quantities of produce within a very narrow window of time. For example, indeterminate tomatoes produce abundantly, then fade, and squash produces great until the squash vine borer attacks. Staggering plantings in different locations withing a garden on 7 to 28 day intervals will help improve the consistency of your vegetable supply. However, be sure to separate your staggered plantings by either space or unrelated crops in order to keep pests from spreading from one planting to the next. In addition to staggering you planting dates, you probably should consider crop rotation whenever you plant vegetables.
Crop rotation refers to planting different vegetables on the same land from year to year.
One last thing to remember, whether you are replanting, successive cropping, or staggering your planting try to plant vegetable varieties that are resistant to insect and disease pressure when available. VFN tomatoes are a good example. These tomatoes are resistant to Verticillum wilt, Fusarium wilt, and Nematodes. If you are going to stack the deck it might as well be in your favor. Between the drought and water bans, some summer plantings are probably going to wind up in the compost pile.