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New York · county maple atlas

Maple sugaring in St. Lawrence County, New York

St. Lawrence County had 106 maple operations and 277,319 taps in the 2022 Census, number 3 in New York. Around Canton, sap usually runs from March 8 to April 13. Here's the long-run pattern, 36 seasons of sap weather, and the outlook this week.
Too early to tapAbout 153 days until the usual start.
Sap starts
Mar 8
typical year
Season ends
Apr 13
about 5 weeks
Sap days / season
37
1991–2026 average
Taps, 2022
277,319
#3 of 50 in NY

Sap-flow outlook at Canton right now

Full New York forecast →

Forecast for Canton, NY

Updated Oct 6, 2:25 AM EDT

Off-season for now. Sap needs freezing nights, and none are in sight. St. Lawrence County's season usually opens around March 8, which is 153 days away.

No freeze-thaw days in the forecast

freeze thaw 32°F

  1. WedOct 7
    38° / 65°

    0h below · 24h above

    No refreeze forecast
  2. ThuOct 8
    50° / 63°

    0h below · 24h above

    No refreeze forecast
  3. FriOct 9
    41° / 57°

    0h below · 24h above

    No refreeze forecast
  4. SatOct 10
    40° / 58°

    0h below · 24h above

    No refreeze forecast
  5. SunOct 11
    46° / 69°

    0h below · 24h above

    No refreeze forecast
  6. MonOct 12
    53° / 66°
    No refreeze forecast

Data: National Weather Service. Verdicts use freeze-thaw thresholds from maple field research; your woods may run a little differently.

When the sap runs

The sugaring calendar at Canton

Freeze-thaw weather at Canton peaks in the weeks of Mar 9 to Apr 6, which hold about 38% of a season's sap days. March is the busiest month.
Typical season: Mar 8 – Apr 130246Week of Dec 1: 1.6 sap days on averageWeek of Dec 8: 1.8 sap days on averageWeek of Dec 15: 1.5 sap days on averageWeek of Dec 22: 1.4 sap days on averageWeek of Dec 29: 1.1 sap days on averageWeek of Jan 5: 1.1 sap days on averageWeek of Jan 12: 0.8 sap days on averageWeek of Jan 19: 1.0 sap days on averageWeek of Jan 26: 0.7 sap days on averageWeek of Feb 2: 0.9 sap days on averageWeek of Feb 9: 1.1 sap days on averageWeek of Feb 16: 1.8 sap days on averageWeek of Feb 23: 1.7 sap days on averageWeek of Mar 2: 1.8 sap days on averageWeek of Mar 9: 2.2 sap days on averageWeek of Mar 16: 2.5 sap days on averageWeek of Mar 23: 3.2 sap days on averageWeek of Mar 30: 3.0 sap days on averageWeek of Apr 6: 3.0 sap days on averageWeek of Apr 13: 1.9 sap days on averageWeek of Apr 20: 1.4 sap days on averageWeek of Apr 27: 1.0 sap days on averageWeek of May 4: 0.3 sap days on averageWeek of May 11: 0.2 sap days on averageWeek of May 18: 0.1 sap days on averageWeek of May 25: 0.1 sap days on averageDecJanFebMarAprMaytaps in ~Mar 8
Average number of freeze-thaw sap days in each week of the season at Canton, 1991–2026. A sap day is an overnight low under 30.2 °F followed by an afternoon high over 37.4 °F. The shaded band is the typical season.

Year-to-year spread

Opening signal
Median Mar 12; the middle half of seasons fell between Mar 4 and Mar 16. Earliest Feb 16 (2012), latest Mar 22 (2018).
Closing signal
Median Apr 13; middle half between Apr 7 and Apr 16. Earliest Mar 12 (2012), latest Apr 23 (1997).
Sap days by month
Dec18%Jan11%Feb15%Mar29%Apr25%May2%

36 seasons of sap weather

St. Lawrence County seasons, 1991–2026

The best sap year at Canton was 2016 with 50 freeze-thaw days; the leanest was 2015 with 27. Seasons that start early tend to end early too: the trees run on the swing between freezing nights and mild days, and heat ends it.
JanFebMarAprMaysap days20262026: Mar 9 – Apr 12, 32 sap days3220252025: Mar 8 – Apr 11, 30 sap days3020242024: Feb 23 – Mar 30, 32 sap days3220232023: Mar 10 – Apr 10, 43 sap days4320222022: Mar 9 – Apr 11, 44 sap days4420212021: Mar 3 – Apr 6, 28 sap days2820202020: Mar 4 – Apr 7, 49 sap days4920192019: Mar 18 – Apr 17, 37 sap days3720182018: Mar 22 – Apr 23, 44 sap days4420172017: Mar 7 – Apr 8, 35 sap days3520162016: Mar 12 – Apr 16, 50 sap days5020152015: Mar 19 – Apr 19, 27 sap days2720142014: Mar 17 – Apr 20, 32 sap days3220132013: Mar 13 – Apr 13, 41 sap days4120122012: Feb 16 – Mar 12, 45 sap days4520112011: Mar 12 – Apr 16, 29 sap days2920102010: Feb 26 – Mar 28, 29 sap days2920092009: Mar 11 – Apr 15, 40 sap days4020082008: Mar 14 – Apr 16, 30 sap days3020072007: Mar 14 – Apr 12, 32 sap days3220062006: Feb 28 – Apr 3, 37 sap days3720052005: Mar 14 – Apr 16, 37 sap days3720042004: Mar 14 – Apr 17, 30 sap days3020032003: Mar 16 – Apr 18, 28 sap days2820022002: Mar 9 – Apr 8, 45 sap days4520012001: Mar 19 – Apr 20, 30 sap days3020002000: Feb 21 – Mar 28, 36 sap days3619991999: Mar 10 – Apr 13, 47 sap days4719981998: Feb 27 – Mar 25, 35 sap days3519971997: Mar 19 – Apr 23, 40 sap days4019961996: Mar 18 – Apr 16, 41 sap days4119951995: Feb 28 – Apr 3, 46 sap days4619941994: Mar 16 – Apr 12, 40 sap days4019931993: Mar 16 – Apr 14, 32 sap days3219921992: Mar 20 – Apr 17, 39 sap days3919911991: Mar 3 – Apr 3, 41 sap days41
Each bar runs from the season's opening signal to its closing signal, estimated from daily temperatures at Canton. Dashed lines mark the typical dates. The right column counts freeze-thaw sap days from December through May.

Maple production

St. Lawrence County in the Census of Agriculture

USDA counts maple operations every five years. In St. Lawrence County the 2022 Census found 106 farms making syrup (-2% since 2017), with taps +34% and syrup output +11% over the same five years. That works out to about 0.26 gallons of syrup per tap in 2022 (0.31 in 2017). Among the 385 counties in this atlas, St. Lawrence County ranks 14 by taps.

St. Lawrence County maple production, 2017 and 2022 (USDA Census of Agriculture)
Census yearFarmsTapsGallons of syrupGal / tap
2022106277,31971,3510.26
2017108206,42964,3710.31

Nearby

Neighboring maple counties

Distances are between reference towns; typical dates are each county's own estimate.

About these numbers

The season dates are estimated from 36 seasons of daily high and low temperatures for the PRISM 4-km grid cell at Canton (400ft), scored with the same freeze-thaw rule as our live forecast: a sap day is an overnight low under 30.2 °F followed by an afternoon high over 37.4 °F. Each season's closing signal is the last sap day before accumulated warmth reaches a threshold, and the opening signal sits five weeks before that, never earlier than the first real freeze-thaw week. Tested against 117 state-seasons of USDA-reported dates, the rule lands within 5.5 days of the reported close and 6.6 days of the reported opening on average, and the typical dates shown here are scaled to New York's USDA record (12 years). Production figures are copied from the Census as published. Full method, calibration tables and the downloadable dataset →

Sources · 6

  1. 1.2022 Census of Agriculture, County Level Data — New York, Table 37: Maple Syrup, 2022 and 2017 · USDA National Agricultural Statistics Service
  2. 2.PRISM daily temperature grids (AN81d, 4 km), accessed 2026-10-05 · PRISM Group, Oregon State University, https://prism.oregonstate.edu
  3. 3.Applied Climate Information System (ACIS) web services · NOAA Regional Climate Centers
  4. 4.USDA NASS maple syrup reports — approximate average season opened and closed dates, 2011–2022 · USDA National Agricultural Statistics Service (mirrored by the University of Vermont)
  5. 5.Sap flow in sugar maple: timing and weather drivers (Frontiers in Agronomy, 2025) · de Lima Santos et al.
  6. 6.GeoNames gazetteer (cities500), CC BY 4.0 · GeoNames

FAQ

St. Lawrence County sugaring questions

When should I tap maple trees in St. Lawrence County, New York?
In a typical year the sap starts running around March 8 near Canton and the season winds down around April 13. Have your taps in a day or two before the first forecast string of freezing nights and 40 °F days. In the past 36 seasons the weather signal came as early as Feb 16 and as late as Mar 22.
How much maple syrup does St. Lawrence County produce?
The 2022 Census of Agriculture counted 106 maple operations in St. Lawrence County with 277,319 taps producing 71,351 gallons of syrup, ranking 3 of 50 New York's counties with published tap counts.
How many sap days does St. Lawrence County get in a season?
On average 37 freeze-thaw sap days from December through May at Canton, of which about 10.3 are textbook days with a night in the 20s and a day in the 40s. The best season since 1991 was 2016 (50 sap days); the leanest was 2015 (27).
Where do these dates come from?
From 36 seasons of daily high and low temperatures at Canton (PRISM 4-km grid), scored with the same freeze-thaw rule as our live forecast, then calibrated against USDA's reported season dates for New York. They describe a typical year at one point in the county; your sugarbush, slope and elevation can shift them by days.

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