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New Brunswick · maple atlas

Maple sugaring in Carleton, New Brunswick

Carleton is a county in New Brunswick. Statistics Canada's 2021 Census of Agriculture counted 24 farms reporting maple taps and 472,400 taps here, number 3 in New Brunswick. Around Woodstock, sap usually runs from March 21 to April 23. Here's the long-run pattern, 35 seasons of sap weather, and the outlook this week.
Too early to tapAbout 165 days until the usual start.
Sap starts
Mar 21
weather estimate
Season ends
Apr 23
about 5 weeks
Sap days / season
38.8
1991–2025 average
Taps, 2021
472,400
#3 of 4 in NB

Sap-flow outlook at Woodstock right now

Full New Brunswick forecast →

Forecast for Woodstock, NB

Updated Oct 7, 10:00 AM EDT

Off-season for now. Sap needs freezing nights, and none are in sight. Carleton's season usually opens around March 21, which is 165 days away.

No freeze-thaw days in the forecast

freeze thaw 0 °C

  1. ThuOct 8
    6° / 16°
    No refreeze forecast
  2. FriOct 9
    6° / 17°
    No refreeze forecast
  3. SatOct 10
    3° / 12°
    No refreeze forecast
  4. SunOct 11
    3° / 15°
    No refreeze forecast
  5. MonOct 12
    10° / 15°
    No refreeze forecast
  6. TueOct 13
    8° / 13°
    No refreeze forecast

Data: Environment and Climate Change Canada. Verdicts use freeze-thaw thresholds from maple field research; your woods may run a little differently.

When the sap runs

The sugaring calendar at Woodstock

Freeze-thaw weather at Woodstock peaks in the weeks of Mar 9 to Apr 20, which hold about 57% of a season's sap days. April is the busiest month. Typical dates are a weather estimate (no official season record for this province): the median of this division's own weather signals.
Typical season: Mar 21 – Apr 230246Week of Dec 1: 1.6 sap days on averageWeek of Dec 8: 1.1 sap days on averageWeek of Dec 15: 1.1 sap days on averageWeek of Dec 22: 0.9 sap days on averageWeek of Dec 29: 0.6 sap days on averageWeek of Jan 5: 0.4 sap days on averageWeek of Jan 12: 0.5 sap days on averageWeek of Jan 19: 0.6 sap days on averageWeek of Jan 26: 0.4 sap days on averageWeek of Feb 2: 0.8 sap days on averageWeek of Feb 9: 0.7 sap days on averageWeek of Feb 16: 1.1 sap days on averageWeek of Feb 23: 1.3 sap days on averageWeek of Mar 2: 1.6 sap days on averageWeek of Mar 9: 2.5 sap days on averageWeek of Mar 16: 2.8 sap days on averageWeek of Mar 23: 3.6 sap days on averageWeek of Mar 30: 3.7 sap days on averageWeek of Apr 6: 3.7 sap days on averageWeek of Apr 13: 3.3 sap days on averageWeek of Apr 20: 2.5 sap days on averageWeek of Apr 27: 2.0 sap days on averageWeek of May 4: 1.1 sap days on averageWeek of May 11: 0.6 sap days on averageWeek of May 18: 0.2 sap days on averageWeek of May 25: 0.1 sap days on averageDecJanFebMarAprMaytaps in ~Mar 21
Average number of freeze-thaw sap days in each week of the season at Woodstock, 1991–2025 (Daymet temperatures). A sap day is an overnight low under −1 °C (30.2 °F) followed by an afternoon high over +3 °C (37.4 °F). The shaded band is the typical season.

Year-to-year spread

Opening signal
Median Mar 21; the middle half of seasons fell between Mar 17 and Mar 25. Earliest Feb 28 (2010), latest Mar 30 (1997).
Closing signal
Median Apr 23; middle half between Apr 18 and Apr 26. Earliest Mar 28 (2010), latest May 4 (2020).
Sap days by month
Dec13%Jan6%Feb10%Mar31%Apr35%May7%

35 seasons of sap weather

Carleton seasons, 1991–2025

The best sap year at Woodstock was 2016 with 53 freeze-thaw days; the leanest was 2003 with 28. 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 days20252025: Mar 21 – Apr 18, 34 sap days3420242024: Mar 16 – Apr 20, 50 sap days5020232023: Mar 21 – Apr 21, 48 sap days4820222022: Mar 20 – Apr 24, 51 sap days5120212021: Mar 10 – Apr 14, 29 sap days2920202020: Mar 30 – May 4, 53 sap days5320192019: Mar 25 – Apr 18, 30 sap days3020182018: Mar 25 – Apr 23, 47 sap days4720172017: Mar 22 – Apr 25, 30 sap days3020162016: Mar 20 – Apr 18, 53 sap days5320152015: Mar 27 – May 1, 29 sap days2920142014: Mar 25 – Apr 26, 29 sap days2920132013: Mar 19 – Apr 23, 38 sap days3820122012: Mar 10 – Apr 14, 42 sap days4220112011: Mar 24 – Apr 25, 34 sap days3420102010: Feb 28 – Mar 28, 35 sap days3520092009: Mar 21 – Apr 21, 37 sap days3720082008: Mar 20 – Apr 23, 30 sap days3020072007: Mar 24 – Apr 26, 45 sap days4520062006: Mar 7 – Apr 11, 37 sap days3720052005: Mar 18 – Apr 22, 43 sap days4320042004: Mar 23 – Apr 26, 38 sap days3820032003: Mar 26 – Apr 30, 28 sap days2820022002: Mar 15 – Apr 11, 36 sap days3620012001: Mar 28 – Apr 30, 37 sap days3720002000: Mar 9 – Apr 12, 41 sap days4119991999: Mar 17 – Apr 21, 49 sap days4919981998: Mar 13 – Apr 16, 31 sap days3119971997: Mar 30 – May 3, 41 sap days4119961996: Mar 20 – Apr 20, 36 sap days3619951995: Mar 28 – May 2, 40 sap days4019941994: Mar 22 – Apr 26, 37 sap days3719931993: Mar 17 – Apr 20, 34 sap days3419921992: Mar 28 – Apr 30, 38 sap days3819911991: Mar 22 – Apr 26, 47 sap days47
Each bar runs from the season's opening signal to its closing signal, estimated from daily Daymet temperatures at Woodstock. Dashed lines mark the typical dates. The right column counts freeze-thaw sap days from December through May.

Maple production

Carleton in the Census of Agriculture

Statistics Canada counts the farms that report maple taps in its Census of Agriculture every five years. In 2021 it counted 24 in Carleton, with 472,400 taps; in 2016, 23 farms and 304,718 taps. Among New Brunswick's 4 census divisions with a published tap count, Carleton ranks 3rd, and 28th of the 94 in this atlas.

Over the five years the farm count changed +4% and taps +55%. Statistics Canada cautions that 2021 and 2016 are not strictly comparable: the census-farm definition changed in 2021, and farms were assigned to their main location more strictly.

Statistics Canada doesn't publish syrup volume by census division, so the Canadian pages show farms and taps, not gallons or litres.

Carleton maple production, 2016 and 2021 (Statistics Canada, Census of Agriculture)
Census yearFarms reporting tapsTaps
202124472,400
201623304,718

Nearby

Neighboring maple divisions

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

About these numbers

The season dates are estimated from 35 seasons of daily high and low temperatures for the Daymet 1-km grid cell at Woodstock, the division's most populous municipality in the 2021 Census; the cell sits at 61 m (200 ft). Each day is scored with the same freeze-thaw rule as our live forecast: a sap day is an overnight low under −1 °C (30.2 °F) followed by an afternoon high over +3 °C (37.4 °F). A season's closing signal is the last sap day before accumulated warmth reaches a threshold, and the opening signal sits 35 days before that, never earlier than the first real freeze-thaw week. The rule was calibrated on 117 state-seasons of USDA-reported dates in the US and is applied here unchanged. New Brunswick has no official season record, so the typical dates are a weather estimate. Production figures are copied from Statistics Canada as published. Full method, the Daymet checks and the Quebec validation → Run a sugarhouse here? Put this sap forecast on your own website →

Sources · 7

  1. 1.Maple taps, Census of Agriculture, 2021 (Table 32-10-0362-01) · Statistics Canada
  2. 2.Maple taps, Census of Agriculture, 2011 and 2016 (Table 32-10-0423-01) · Statistics Canada
  3. 3.Daymet: Daily Surface Weather Data on a 1-km Grid for North America, Version 4 R1 · ORNL DAAC
  4. 4.Sap flow in sugar maple: timing and weather drivers (Frontiers in Agronomy, 2025) · de Lima Santos et al.
  5. 5.2021 Census cartographic boundary files (census divisions, population centres) · Statistics Canada
  6. 6.Population and dwelling counts, 2021 Census (Tables 98-10-0002-01 and 98-10-0011-01) · Statistics Canada
Show 1 more
  1. 7.GeoNames geographical database (CA) · GeoNames

Licences and attribution

  • Adapted from Statistics Canada, Census of Agriculture 2021 and 2016 (Tables 32-10-0362-01 and 32-10-0423-01), 2021 Census population and dwelling counts (Tables 98-10-0002-01 and 98-10-0011-01) and 2021 Census cartographic boundary files. This does not constitute an endorsement by Statistics Canada of this product.
  • Contains information licensed under the Open Government Licence – Canada.
  • Thornton, M.M., R. Shrestha, Y. Wei, P.E. Thornton, S-C. Kao, and B.E. Wilson. 2022. Daymet: Daily Surface Weather Data on a 1-km Grid for North America, Version 4 R1. ORNL DAAC, Oak Ridge, Tennessee, USA. https://doi.org/10.3334/ORNLDAAC/2129
  • Place coordinates: GeoNames (geonames.org), CC BY 4.0.

FAQ

Carleton sugaring questions

When should I tap maple trees in Carleton, New Brunswick?
In a typical year the sap starts running around March 21 near Woodstock and the season winds down around April 23. Have your taps in a day or two before the first forecast string of nights below −1 °C and days above +3 °C. In the past 35 seasons the weather signal came as early as Feb 28 and as late as Mar 30.
How much maple syrup does Carleton produce?
Statistics Canada doesn't publish syrup volume by census division. Its 2021 Census of Agriculture counted 24 farms reporting 472,400 maple taps in Carleton, number 3 of 4 New Brunswick divisions with a published count.
How many sap days does Carleton get in a season?
On average 38.8 freeze-thaw sap days from December through May at Woodstock, of which about 13.3 are textbook days with a night between about −7 and −2 °C and a day between 4 and 9 °C. The best season since 1991 was 2016 (53 sap days); the leanest was 2003 (28).
Where do these dates come from?
From 35 seasons of daily high and low temperatures at Woodstock (Daymet 1-km grid), scored with the same freeze-thaw rule as our live forecast. New Brunswick has no official season record, so they are a weather estimate. They describe a typical year at one point in the division; your sugarbush, slope and elevation can shift them by days.

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