Frost Dates for Plattsburgh, NY 12901

Last spring frost May 12 · First fall frost October 1 · 142 frost-free days · USDA Zone 5a

Frost probability for 12901

Frost10%50%90%
Spring (last frost)May 25May 12April 28
Fall (first frost)September 21October 1October 11

Dates come from NOAA 1971–2000 freeze probabilities at the nearest reporting station (17.6 km away); the 50% date is the median year.

Frost dates by ZIP code in Plattsburgh, NY

ZIPLast spring frost (50%)First fall frost (50%)Zone
12901May 12October 15a
12903May 12October 15a

Month by month in Plattsburgh

MonthWhat to do
JanuaryPlan your garden layout and order seeds. Research varieties suited to your frost dates.
FebruaryStart the slowest-growing crops indoors: onions, leeks, and celery (10–12 weeks before last frost).
MarchStart peppers and eggplant indoors 8–10 weeks before your last frost (around May 12). Start tomatoes about two weeks later, 6–8 weeks before last frost.
AprilStart herbs, basil, and squash indoors (4–6 weeks before frost). Direct sow peas, spinach, and lettuce if soil is workable.
MayLast frost around May 12. Transplant cold-hardy crops (broccoli, kale, cabbage). Harden off tomato and pepper seedlings.
JuneFrost has passed. Transplant tomatoes, peppers, and basil outdoors. Direct sow beans, cucumbers, squash, and zucchini.
JulySuccession plant lettuce and greens. Keep beds weeded and watered consistently.
AugustHarvest regularly to encourage production. Monitor for pests and disease.
SeptemberFirst fall frost approaching (around October 1). Transplant fall brassicas. Sow spinach, arugula, and radishes.
OctoberFirst frost around October 1. Harvest tomatoes and peppers before frost. Cover cold-hardy crops with row covers to extend the season.
NovemberHarvest remaining cold-hardy crops: kale, carrots, and beets. Plant garlic bulbs for next year.
DecemberClean up spent plants. Add compost to beds. Rest, review, and plan next year's garden.

What grows in a 142-day season

Frequently Asked Questions

What is the last frost date for Plattsburgh, NY (ZIP 12901)?

The median last spring frost date for Plattsburgh, NY (ZIP code 12901) is around May 12. This is the 50th-percentile date — meaning half of all years see frost end before this date. Use the 10% and 90% dates to understand the full range of risk in your area.

What is the first fall frost date in Plattsburgh, NY?

The median first fall frost date for Plattsburgh, NY is around October 1. Plan to harvest or protect frost-sensitive crops like tomatoes and peppers at least a week before this date to avoid losses.

How long is the growing season in Plattsburgh, NY?

The frost-free growing season in Plattsburgh is about 142 days. This window — from your last spring frost to your first fall frost — is when warm-season vegetables thrive. Cold-hardy crops like kale, spinach, and peas can extend your season by weeks on either side.

What USDA hardiness zone is Plattsburgh, NY?

Based on frost date patterns, Plattsburgh falls approximately in 5a. USDA hardiness zones are determined by average annual minimum winter temperatures and guide both plant selection and planting timing for your location.

When should I start tomatoes indoors in Plattsburgh, NY?

Start tomato seeds indoors 6–8 weeks before your last frost date (around May 12). For Plattsburgh, that's roughly March 17 to March 31. Transplant outdoors 1–2 weeks after your last frost.

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