Gardening in New York: zones, frost dates and when to plant

Coast, lakes and highlands

Water and elevation shape New York’s growing regions. NOAA’s state climate summary notes that the Atlantic moderates the coast, while the Great Lakes temper the northwest and Lake Champlain the northeast. Prevailing westerly winds bring air from the continental interior across the whole state, along with occasional bitter cold in winter. Storms, floods, droughts and heat waves all show up in the record.

That’s why Cornell Cooperative Extension publishes planting guidance by region instead of one statewide chart. Its Vegetable Gardening FAQs sends Long Island gardeners to the Suffolk County planting-times sheet and northern New York gardeners to the Clinton County growing guide. For the rest of upstate, the Tompkins County first-and-last planting dates, based on observations at Ithaca, are the usual reference.

When to plant, by crop group

The Tompkins County sheet sorts vegetables into three spring groups. Use the frost dates for your city above to place them:

• As early as the soil can be worked: beets, carrots, kale, kohlrabi, leeks, lettuce, mustard, onions, parsley, peas, radish, spinach, Swiss chard, turnips and rutabagas. Broccoli, Brussels sprouts, cabbage, cauliflower and celery can be seeded then, but transplants go out somewhat later.
• After the average last frost: beans, popcorn, potatoes, sweet corn, and transplants of tomatoes, peppers and eggplant.
• After the soil has warmed: basil, cucumbers, okra, summer and winter squash, pumpkins, and transplanted muskmelons and watermelons.

The same sheet gives last planting dates for fall harvests. It warns that crops picked repeatedly, such as tomatoes, peppers and cucumbers, give light yields when planted late unless fall runs warm. Where fall is milder than Ithaca, you can plant a week to ten days later. In cooler areas, plant 7 to 10 days earlier. Early-maturing varieties can go in later than slow, late varieties.

What holds New York gardeners back

Wet spring soil. Both the Long Island sheet and the statewide FAQs make the same point: the season may run a week or two ahead of or behind schedule, and soggy ground is often the real limit. Tilling wet soil damages its structure, leaving a hard surface crust and clods that get in the way of seeding and rooting. NOAA reports a large increase in heavy rain events in New York and projects wetter winters and springs, which raises the risk of flooding that delays planting.

Short, cool seasons up north. The Northern New York guide pushes heat-loving crops toward transplants and warmed soil. For melons it suggests starting plants indoors, laying plastic mulch to warm the soil, and covering young transplants with fabric row covers. It also advises matching days to harvest to the length of your season. Melons and watermelons are direct-seeded only once soil reaches 70°F, one to two weeks after the average last frost. For tomatoes, it recommends black plastic and row covers to speed soil warming, with covers removed at flowering so bees can pollinate.

Frost pockets. The same guide warns against planting asparagus in frost pockets, where late frosts damage the spears. It favors all-male hybrids such as ‘Jersey Giant’, ‘Jersey King’ and ‘Jersey Knight’ for higher yields.

Varieties named by Cornell Cooperative Extension

The Northern New York guide lists varieties to try. For tomatoes: early ‘Cascade’, ‘Sunrise’ and ‘Lemon Boy’; main-season ‘Better Boy’ and ‘Jetstar’; paste ‘Roma’, ‘Nova’ and ‘Classica’; and cherry types ‘Supersweet 100’, ‘Sungold’, ‘Fruity Orange’ and ‘Early Cherry’. For orange-fleshed muskmelons it lists ‘Ambrosia’, ‘Athena’, ‘Earliqueen’, ‘Fastbreak’, ‘Iroquois’ and others, plus green-fleshed ‘Early Dew’ and ‘Passport’. For bush snap beans, its list includes ‘Bush Bluelake’, ‘Derby’ and ‘Jade’.

On Long Island, the Suffolk County sheet times crops for the coast. Peas go in from late March, onions and carrots in early April, and pepper and eggplant transplants in late May to early June. Broccoli can be set out from early April through early September.

Soil and water

The Northern New York guide gives a target pH for most crops in the slightly acidic range, such as 6.0 to 6.8 for tomatoes and beans. For a lab test, Cornell Cooperative Extension’s Harvest New York runs a Community Gardens Soil Testing Program with the Cornell Soil Health Laboratory and the state Department of Agriculture and Markets. It is free for noncommercial food gardeners while supplies last. Results cover nutrients, pH, organic matter and heavy metals, and CCE specialists follow up with advice. Your county CCE office can also help.

If you collect rainwater for the garden, the FAQs advise against it when roofs or gutters involve lead solder or paint, treated cedar shakes, asphalt shingles, copper or moss-control treatments.