Article: You can look local frost dates up online. Frost dates are the dates where frost can be expected overnight or in the morning. The Farmer's Almanac online can help you find your frost date by entering your zip code. It's important to plant zinnias after the last frost date in the spring. Zinnia seeds will not survive if they're exposed to frost. It's a good idea to wait a few days or a few weeks after the last predicted frost date. Weather is unpredictable and there's always a chance the forecast could be wrong. If your pH is too high or too low, you can take measures to adjust soil pH. Adding organic materials to your soil, which you can purchase online or at a greenhouse, can alter your soil's pH.  Limestone is your best option to raise pH levels. Limestone should be added to the top seven inches of your soil. To lower pH levels, opt for acidic materials such as pine needles and peat moss. If you need to lower your soil's pH fast, opt for sulfur. If you don't want to alter your soil's pH, plant your zinnias in a pot or raised gardening bed with potting soil that has the right pH level.

What is a summary?
Check your local frost dates. Adjust your soil as necessary.