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Quebec · maple atlas

Maple sugaring in Longueuil, Quebec

Longueuil is an equivalent territory in Quebec: a city or urban agglomeration outside any MRC that counts as its own census division. Statistics Canada's 2021 Census of Agriculture counted 13 farms reporting maple taps here (taps withheld by Statistics Canada). Around Longueuil, sap usually runs from March 8 to April 14. Here's the long-run pattern, 35 seasons of sap weather, and the outlook this week.
Too early to tapAbout 152 days until the usual start.
Sap starts
Mar 8
producers' record
Season ends
Apr 14
about 5 weeks
Sap days / season
25.4
1991–2025 average
Taps, 2021
withheld
by Statistics Canada

Sap-flow outlook at Longueuil right now

Full Quebec forecast →

Forecast for Longueuil, QC

Updated Oct 7, 11:30 AM EDT

Off-season for now. Sap needs freezing nights, and none are in sight. Longueuil's season usually opens around March 8, which is 152 days away.

No freeze-thaw days in the forecast

freeze thaw 0 °C

  1. ThuOct 8
    12° / 17°
    No refreeze forecast
  2. FriOct 9
    9° / 14°
    No refreeze forecast
  3. SatOct 10
    4° / 14°
    No refreeze forecast
  4. SunOct 11
    10° / 24°
    No refreeze forecast
  5. MonOct 12
    13° / 18°
    No refreeze forecast
  6. TueOct 13
    11° / 15°
    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 Longueuil

Freeze-thaw weather at Longueuil peaks in the weeks of Mar 9 to Apr 6, which hold about 45% of a season's sap days. March is the busiest month. Typical dates are anchored to producers' reported season in the region (Houle et al. 2015, 1999–2011): this division's weather signals, moved 6.8 days earlier for the opening and 1.4 for the closing, the average gap to that record. The spread and the year-by-year bars below are the unadjusted weather signal.
Typical season: Mar 8 – Apr 140246Week of Dec 1: 1.3 sap days on averageWeek of Dec 8: 1.1 sap days on averageWeek of Dec 15: 1.0 sap days on averageWeek of Dec 22: 0.7 sap days on averageWeek of Dec 29: 0.7 sap days on averageWeek of Jan 5: 0.5 sap days on averageWeek of Jan 12: 0.5 sap days on averageWeek of Jan 19: 0.4 sap days on averageWeek of Jan 26: 0.4 sap days on averageWeek of Feb 2: 0.6 sap days on averageWeek of Feb 9: 0.6 sap days on averageWeek of Feb 16: 0.9 sap days on averageWeek of Feb 23: 1.1 sap days on averageWeek of Mar 2: 1.4 sap days on averageWeek of Mar 9: 2.0 sap days on averageWeek of Mar 16: 1.9 sap days on averageWeek of Mar 23: 2.5 sap days on averageWeek of Mar 30: 2.7 sap days on averageWeek of Apr 6: 2.3 sap days on averageWeek of Apr 13: 1.5 sap days on averageWeek of Apr 20: 0.8 sap days on averageWeek of Apr 27: 0.4 sap days on averageWeek of May 4: 0.1 sap days on averageWeek of May 11: 0.0 sap days on averageWeek of May 18: 0.0 sap days on averageWeek of May 25: 0.0 sap days on averageDecJanFebMarAprMaytaps in ~Mar 8
Average number of freeze-thaw sap days in each week of the season at Longueuil, 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 15; the middle half of seasons fell between Mar 10 and Mar 20. Earliest Mar 1 (2000), latest Mar 29 (2015).
Closing signal
Median Apr 15; middle half between Apr 9 and Apr 17. Earliest Mar 28 (2010), latest Apr 23 (1994).
Sap days by month
Dec17%Jan8%Feb12%Mar34%Apr27%May1%

35 seasons of sap weather

Longueuil seasons, 1991–2025

The best sap year at Longueuil was 1999 with 41 freeze-thaw days; the leanest was 2015 with 13. 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 11 – Apr 10, 23 sap days2320242024: Mar 2 – Apr 3, 26 sap days2620232023: Mar 11 – Apr 9, 33 sap days3320222022: Mar 11 – Apr 5, 26 sap days2620212021: Mar 9 – Apr 3, 23 sap days2320202020: Mar 9 – Apr 8, 36 sap days3620192019: Mar 19 – Apr 17, 23 sap days2320182018: Mar 23 – Apr 23, 36 sap days3620172017: Mar 9 – Apr 9, 13 sap days1320162016: Mar 22 – Apr 16, 32 sap days3220152015: Mar 29 – Apr 16, 13 sap days1320142014: Mar 28 – Apr 20, 17 sap days1720132013: Mar 15 – Apr 15, 29 sap days2920122920112011: Mar 16 – Apr 16, 20 sap days2020102010: Mar 2 – Mar 28, 17 sap days1720092009: Mar 13 – Apr 14, 31 sap days3120082008: Mar 17 – Apr 16, 19 sap days1920072007: Mar 16 – Apr 11, 23 sap days2320062006: Mar 7 – Apr 9, 19 sap days1920052005: Mar 14 – Apr 16, 23 sap days2320042004: Mar 17 – Apr 17, 27 sap days2720032003: Mar 19 – Apr 18, 17 sap days1720022002: Mar 11 – Apr 11, 29 sap days2920012001: Mar 21 – Apr 19, 26 sap days2620002000: Mar 1 – Apr 4, 30 sap days3019991999: Mar 12 – Apr 16, 41 sap days4119981998: Mar 9 – Apr 12, 16 sap days1619971997: Mar 23 – Apr 15, 24 sap days2419961996: Mar 18 – Apr 16, 26 sap days2619951995: Mar 15 – Apr 18, 37 sap days3719941994: Mar 20 – Apr 23, 26 sap days2619931993: Mar 24 – Apr 7, 23 sap days2319921992: Mar 22 – Apr 17, 24 sap days2419911991: Mar 9 – Apr 12, 33 sap days33
Each bar runs from the season's opening signal to its closing signal, estimated from daily Daymet temperatures at Longueuil. Dashed lines mark the typical dates. The right column counts freeze-thaw sap days from December through May.

Maple production

Longueuil 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 13 in Longueuil; in 2016, 3 farms.

Over the five years the farm count changed +333%. 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.

Longueuil maple production, 2016 and 2021 (Statistics Canada, Census of Agriculture)
Census yearFarms reporting tapsTaps
202113Ewithheld by Statistics Canada
20163withheld by Statistics Canada
  • E Statistics Canada quality grade: use with caution.
  • "Withheld by Statistics Canada": Statistics Canada suppressed the value as too unreliable to publish (F) or to protect confidentiality (x). The farm count is still published.

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 Longueuil, the division's most populous municipality in the 2021 Census; the cell sits at 27 m (89 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. In Quebec it reproduces the pattern between regions in producers' reported seasons (Houle et al. 2015), and the typical dates are anchored to that record. 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 · 8

  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.Impacts of climate change on the timing of the production season of maple syrup in eastern Canada (PLOS ONE 10(12): e0144844, 2015) · Houle et al.
  5. 5.Sap flow in sugar maple: timing and weather drivers (Frontiers in Agronomy, 2025) · de Lima Santos et al.
  6. 6.2021 Census cartographic boundary files (census divisions, population centres) · Statistics Canada
Show 2 more
  1. 7.Population and dwelling counts, 2021 Census (Tables 98-10-0002-01 and 98-10-0011-01) · Statistics Canada
  2. 8.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

Longueuil sugaring questions

When should I tap maple trees in Longueuil, Quebec?
In a typical year the sap starts running around March 8 near Longueuil and the season winds down around April 14. 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 Mar 1 and as late as Mar 29.
How much maple syrup does Longueuil produce?
Statistics Canada doesn't publish syrup volume by census division. Its 2021 Census of Agriculture counted 13 farms reporting maple taps in Longueuil; the tap count was withheld by Statistics Canada.
How many sap days does Longueuil get in a season?
On average 25.4 freeze-thaw sap days from December through May at Longueuil, of which about 10.9 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 1999 (41 sap days); the leanest was 2015 (13).
Where do these dates come from?
From 35 seasons of daily high and low temperatures at Longueuil (Daymet 1-km grid), scored with the same freeze-thaw rule as our live forecast. In Quebec they are anchored to producers' reported season in the region (Houle et al. 2015, 1999–2011). 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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