USDA Hardiness Zone 5a
Frost Dates for 13669 — Ogdensburg, New York
NOAA 1991–2020 normals from Ogdensburg 4 NE, NY (280 ft), 4 miles northeast.
Updated
In Ogdensburg, the last spring frost (32°F) is around April 29 in half of years and has passed by May 11 in nine years out of ten. The first fall frost comes around October 10, as early as September 25 one year in ten, leaving a typical freeze-free season of 162 days (NOAA, Ogdensburg 4 NE, NY).
- Last spring frost
- April 29
- First fall frost
- October 10
- Growing season
- 162 days
- Hardiness zone
- 5a
50% probability
50% probability
freeze-free, 50%
-20 to -15°F (-28.9 to -26.1°C) coldest night
- First snow
- December 1
- Last snow
- March 27
- Winters with snow
- 100%
- Snow per year
- —
median, 1991–2020
median, 1991–2020
21 of 21 observed
NOAA normal
Frost risk by date in Ogdensburg
Half of springs at Ogdensburg 4 NE, NY see their last 32°F night by April 29; only one in ten is past it by April 18, and one in ten still has one after May 11. Planting tender crops after May 3 leaves a 30% risk of a frost on them, after May 6 20%, and after May 11 10%. The 12 days between the even-odds date and the one-in-ten date is narrower than at 94% of the 173 New York stations behind this site's ZIP pages.
In fall the first 32°F night comes by October 10 in half of years, as early as September 25 one year in ten, and holds off past October 28 one year in ten. A hard freeze of 28°F follows 14 days later, around October 24; in spring the one-in-ten date for 28°F is May 1, 10 days before the 32°F one. The freeze-free season lasts 162 days in a typical year, shorter than at 50% of the 173 New York stations; it reaches 183 days one year in ten and falls short of 142 one year in ten. On average 157 nights a year drop to 32°F or below. Nights of 36°F, when frost can still settle on leaves in low, open spots, continue 9 days longer, to about May 8, and return around September 30. Severe cold of 16°F or below comes every winter, usually between November 24 and March 29.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 28 | Apr 30 | May 3 | May 6 | May 8 | May 11 | May 14 | May 19 | May 25 |
| 32°F | Apr 18 | Apr 22 | Apr 25 | Apr 27 | Apr 29 | Apr 30 | May 3 | May 6 | May 11 |
| 28°F | Apr 8 | Apr 11 | Apr 15 | Apr 17 | Apr 20 | Apr 22 | Apr 24 | Apr 28 | May 1 |
| 24°F | Mar 31 | Apr 3 | Apr 5 | Apr 7 | Apr 9 | Apr 12 | Apr 14 | Apr 18 | Apr 21 |
| 20°F | Mar 21 | Mar 26 | Mar 30 | Apr 1 | Apr 2 | Apr 4 | Apr 6 | Apr 8 | Apr 12 |
| 16°F | Mar 14 | Mar 19 | Mar 22 | Mar 26 | Mar 29 | Mar 31 | Apr 2 | Apr 4 | Apr 6 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 15 | Sep 20 | Sep 24 | Sep 27 | Sep 30 | Oct 2 | Oct 5 | Oct 8 | Oct 13 |
| 32°F | Sep 25 | Sep 30 | Oct 3 | Oct 6 | Oct 10 | Oct 14 | Oct 18 | Oct 22 | Oct 28 |
| 28°F | Oct 5 | Oct 11 | Oct 16 | Oct 20 | Oct 24 | Oct 28 | Oct 31 | Nov 3 | Nov 7 |
| 24°F | Oct 20 | Oct 27 | Oct 31 | Nov 3 | Nov 5 | Nov 8 | Nov 11 | Nov 13 | Nov 18 |
| 20°F | Nov 3 | Nov 7 | Nov 10 | Nov 13 | Nov 15 | Nov 18 | Nov 20 | Nov 24 | Nov 28 |
| 16°F | Nov 11 | Nov 15 | Nov 18 | Nov 21 | Nov 24 | Nov 26 | Nov 29 | Dec 2 | Dec 7 |
Freeze probabilities 1991–2020 at Ogdensburg 4 NE, NY, from NOAA NCEI U.S. Climate Normals. Where a temperature is reached in fewer than 99.5% of years, the dates describe only the years that reach it. Not a forecast.
Frost risk on any date in 13669 →Compare Ogdensburg with another place →
Weather by month in Ogdensburg
July is the warmest month at Ogdensburg 4 NE, NY, averaging 80°F by day and 61°F at night; January is the coldest at 26°F and 8°F. A freezing night is all but certain in every month from October to April (a 90% chance or more). From June to August the chance of a 32°F night stays under 10% each month. In spring, May still brings one in 40% of years.
Warmth for growing adds up to 2,378 growing degree days a year (base 50°F), fewer than at 57% of the 173 New York stations. 31% of them (737) have built up by the end of June, and July adds the most, 634.
| Month | High °F | Low °F | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|
| Jan | 26 | 8 | 100% | 30 | 0 |
| Feb | 29 | 9 | 100% | 27 | 0 |
| Mar | 38 | 20 | 100% | 28 | 3 |
| Apr | 52 | 34 | 100% | 15 | 37 |
| May | 66 | 47 | 40% | 1 | 228 |
| Jun | 76 | 56 | 0% | 0 | 469 |
| Jul | 80 | 61 | 0% | 0 | 634 |
| Aug | 79 | 59 | 0% | 0 | 584 |
| Sep | 71 | 50 | 21% | 1 | 333 |
| Oct | 57 | 40 | 92% | 7 | 82 |
| Nov | 45 | 29 | 100% | 21 | 8 |
| Dec | 32 | 18 | 100% | 28 | 0 |
Monthly normals 1991–2020 at Ogdensburg 4 NE, NY (280 ft), NOAA NCEI. "32°F night": chance of at least one in the month. GDD: growing degree days, base 50°F.
Compared with the next station
The nearest other station, Canton 4 SE, NY, 20 miles east of Ogdensburg and 168 feet higher, has a last frost 10 days later (May 9), a first frost 10 days earlier (September 30), a season 20 days shorter.
When it snows in Ogdensburg, New York
The first measurable snow (0.1 inch or more) in Ogdensburg usually arrives around December 1, and the last of the season around March 27. Those are the middle dates across the winters of 1991–2020 at Ogdensburg 4 NE, NY, 3.8 miles away: half of years saw snow earlier, half later. Every one of those winters saw snow. The last 32°F night of spring typically comes 33 days after the last snow.
Planting calendar for 13669
| When | What to do |
|---|---|
| February 18 – March 4 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| March 4 – March 18 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| April 1 – April 15 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| April 29 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by July 18 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by September 26 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| October 10 onward | Plant garlic, mulch beds, lift tender bulbsGarlic wants a cold spell; bare soil loses structure over winter. |
The weeks before and after the 50% dates are general rules of thumb, not NOAA figures; a seed packet gives the timing for each variety.
Where these figures come from
ZIP 13669 is 4 miles from Ogdensburg 4 NE, NY, which stands at 280 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 2 other ZIP codes share the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 13669 in zone 5a, the band where the coldest night of the year averaged -20 to -15°F (-28.9 to -26.1°C) over 1991–2020; a zone describes winter lows, not frost dates.
Hardiness zone and temperature range: USDA Plant Hardiness Zone Map 2023 (USDA-ARS, Oregon State University), ZIP-code listing, unchanged. °C converted from °F by this site.
Thirty-year averages, not a forecast: check the forecast before planting out. How stations are matched and which pages are offered to search engines: methodology.