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Vegetable Crop Calendars (A–C)Vegetable Planting Calendar for Zones 3–5
Gardeners in colder regions work with a short frost-free season, and every week counts. The first step is understanding that a zone number is not a planting date.
Key points
- Hardiness zones describe winter cold, not planting dates.
- Build your calendar from average last and first frost dates.
- Favor cool-season crops and short-season varieties.
- Use covers and transplants to stretch a short season.
Do hardiness zones tell you when to plant?
No. The USDA Plant Hardiness Zone Map shows average annual extreme winter minimum temperature. It does not give frost dates or planting dates. Two gardens in zone 4 can have very different last frost dates depending on elevation, nearby water and local weather patterns.
Use your zone to judge which perennials survive winter, then use your own frost dates for annual vegetables. The National Weather Service and your county extension office are good places to get those dates.
Microclimates matter a great deal in cold places. A south-facing slope, a low spot where cold air pools and a windbreak can each shift your last frost by weeks. Notice where frost lingers in your own yard and plant tender crops in the warmest spots.
How do you build a calendar from frost dates?
Write down your average last spring frost and average first fall frost. The days between them are your growing season. Everything else hangs from those two dates.
For example, if your last frost usually falls around the end of May, cold-tolerant crops go in earlier and tender crops go in after that date. If your first frost usually arrives in late September, you need to count back from there for every crop you want to finish.
Keep a simple chart with four rows: last frost, soil workable, first fall frost and a rough date of hard freeze. Fill it in each year with what actually happened, because averages hide wide swings.
Which vegetables suit a short season?
Cool-season crops such as peas, lettuce, spinach, radishes, onions, kale and root crops often do well in colder places. Their seed germinates in cool soil, and many tolerate light frost. University of Maryland Extension, for example, notes peas can be sown when soil reaches about 40 degrees, a reminder that cold tolerance is a planning advantage.
For warm-season crops, choose short-season varieties and favor early maturity. Check days to maturity on every packet and compare with your frost-free days.
Short-season varieties are often labeled early on seed packets. Ask your extension office which named varieties succeed locally, since catalog descriptions rarely say where a variety was tested.
How do you stretch a short season?
Start tender crops indoors so they go out as sturdy transplants. Use row covers, low tunnels, cold frames or black mulch to warm soil and protect against late frost. These are practical tools, but check local wind and snow load before building anything permanent.
Plant in raised beds or south-facing spots that warm earlier. Keep covers available for both spring and fall.
Season extension has costs. Low tunnels need ventilation on sunny days or plants cook, and covers must be anchored against wind. Plan for the work, not just the materials.
When do cool-season crops go in?
As soon as soil can be worked, sow hardy crops, using a soil thermometer and the packet's germination range. Wet, cold soil rots seed, so wait for crumbly ground.
Do not guess specific dates for your zone. Your extension office may publish a county planting guide with ranges. If you quote a range, note the frost caveat that goes with it.
Hardy crops can go in while nights still fall below freezing, but soil that is cold and wet rots seed. Be patient with the first sowing and let the soil, not your eagerness, decide.
When do warm-season crops go in?
Tomatoes, peppers, squash and beans need frost to be past and soil to be warm. In colder areas, this may be late spring or early summer, and some years it is later still.
Use transplants for crops with long maturity. Keep an eye on forecasts and have covers ready for late cold snaps.
Many northern gardeners start tomatoes, peppers and squash indoors, count backward from the planned transplant date and harden plants off carefully. Minnesota Extension suggests peppers need about eight weeks indoors, which shows how early the work begins.
How do you plan the end of the season?
Count back from first fall frost for each crop, adding a margin. Sow fast crops late and finish slow ones early. Know which crops tolerate light frost and which do not.
At the end of the season, record what worked in a garden journal. Your own notes become the most reliable calendar you will have.
Use the end of the season well. Sow a last round of fast crops such as radishes and spinach where days to maturity fit, and have row covers ready to protect them from the first frosts.
Sources and further reading
Last reviewed: November 2026. Educational information, ranges only. Confirm timing with your county extension office.