September 19, 2026

How to choose vegetables for your garden by frost and water

The vegetables worth planting are the ones your yard's overnight lows and your beds' drying rate can carry. Two numbers decide most of it, the coldest night a bed sees and how fast that bed dries between waterings. Get those right and the crop choice mostly makes itself. This guide walks the steps in order.

Step 1. Find your real frost dates

Start with the last spring frost and first fall frost your beds see. The published dates for our zone are April 28 and October 22. The station in our own garden learned a 7°F cold offset, which pushes our working dates to May 20 and September 30. Because cold air weighs more than warm air, it slides downhill and settles in low corners when the night is still. A bed in a low corner freezes earlier than the map says.

Without a station, you type that offset into settings yourself. Pro pairs with a station and, after roughly 14 overlapping days of station and forecast data, works out the offset for you. Our microclimate checker shows how much colder your area runs, and our guide on why the published date misses explains the reason.

Step 2. Rank your beds by how fast they dry

Watch which beds hold water and which drop fast. A soil probe reads moisture at the root zone, so you can rank your beds instead of guessing. Raised bed 1 in our garden held a narrow 39% to 54% from mid-July into early September. The ground bed swung wider, 32% to 62%, and raised bed 3 ran the same wide swing. The wide-swinging beds dry out fastest between rains and need the closest watch. Our guide on when to water covers how to read those numbers.

Step 3. Put tender crops in your warmest window

Plant tender crops after your real last frost. Tomatoes, peppers, cucumbers, squash, and melons die at a light freeze, so they wait. We set out tomatoes on May 18 and peppers on May 22, close to our effective last frost of May 20. Cool-season crops go in weeks earlier. We direct-seeded peas on March 25 and planted potatoes and onions in early April, well ahead of the tender crops.

Step 4. Match thirsty crops to the beds you keep wet

Celery, cucumbers, zucchini, and squash pull a lot of water and wilt fast in a bed that drains quickly. Give them a bed that holds moisture, or one where you will water on a schedule. Each bed carries its own threshold, 25% by default, and a dry alert reaches you once two consecutive readings sit under it. The alert points to the dry bed, so you water only that one and leave the rest. It sends the warning and leaves the watering to you.

Step 5. Start easy if you are new

Choose fast, forgiving crops for a first year. Radishes come up in days and tell you your soil is alive. Lettuce, spinach, peas, and bush beans forgive a missed watering and crowd out weeds. We direct-seeded radishes across three raised beds in July and lettuce and spinach in the ground bed, and they asked little of us.

What can go wrong

Two common misses both come from trusting the wrong number. Planting warm crops on the published date, before your real last frost, kills them in one cold night. Reading the area's low as your yard's low is the other trap. Our microclimate checker compares the forecast to what nearby home stations recorded over all recent nights, so it reports how much colder your area runs and stops short of promising a date for your yard. A soil probe tells you a bed is dry. It cannot tell you how much water a given crop wants, so you still match the crop to the reading yourself.

Once you know your real frost window and which beds hold water, write a two-column plan. Put tender and thirsty crops in your warm, moisture-holding beds. Put cool and forgiving crops in the fast-draining beds you plant early. Seed the cool crops first, then set out the warm crops after your effective last frost.