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Ontario · maple atlas

Maple sugaring in Perth, Ontario

Perth is a county in Ontario. Ontario's census divisions are its counties, districts and regional municipalities. Statistics Canada's 2021 Census of Agriculture counted 76 farms reporting maple taps and 38,554 taps here. Around Stratford, sap usually runs from March 11 to April 12. Here's the long-run pattern, 35 seasons of sap weather, and the outlook this week.
Too early to tapAbout 155 days until the usual start.
Sap starts
Mar 11
weather estimate
Season ends
Apr 12
about 5 weeks
Sap days / season
28.7
1991–2025 average
Taps, 2021
38,554
#16 of 29 in ON

Sap-flow outlook at Stratford right now

Full Ontario forecast →

Forecast for Stratford, ON

Updated Oct 7, 11:00 AM EDT

Off-season for now. Sap needs freezing nights, and none are in sight. Perth's season usually opens around March 11, which is 155 days away.

No freeze-thaw days in the forecast

freeze thaw 0 °C

  1. ThuOct 8
    9° / 17°
    No refreeze forecast
  2. FriOct 9
    5° / 17°
    No refreeze forecast
  3. SatOct 10
    6° / 24°
    No refreeze forecast
  4. SunOct 11
    16° / 22°
    No refreeze forecast
  5. MonOct 12
    12° / 20°
    No refreeze forecast
  6. TueOct 13
    13° / 16°
    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 Stratford

Freeze-thaw weather at Stratford peaks in the weeks of Mar 9 to Apr 13, which hold about 46% of a season's sap days. March 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 11 – Apr 120246Week of Dec 1: 1.0 sap days on averageWeek of Dec 8: 1.2 sap days on averageWeek of Dec 15: 1.0 sap days on averageWeek of Dec 22: 1.1 sap days on averageWeek of Dec 29: 0.7 sap days on averageWeek of Jan 5: 0.7 sap days on averageWeek of Jan 12: 0.5 sap days on averageWeek of Jan 19: 0.5 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: 0.8 sap days on averageWeek of Feb 16: 1.2 sap days on averageWeek of Feb 23: 1.4 sap days on averageWeek of Mar 2: 1.3 sap days on averageWeek of Mar 9: 1.7 sap days on averageWeek of Mar 16: 2.4 sap days on averageWeek of Mar 23: 2.4 sap days on averageWeek of Mar 30: 2.6 sap days on averageWeek of Apr 6: 2.5 sap days on averageWeek of Apr 13: 1.7 sap days on averageWeek of Apr 20: 1.3 sap days on averageWeek of Apr 27: 0.9 sap days on averageWeek of May 4: 0.2 sap days on averageWeek of May 11: 0.2 sap days on averageWeek of May 18: 0.2 sap days on averageWeek of May 25: 0.0 sap days on averageDecJanFebMarAprMaytaps in ~Mar 11
Average number of freeze-thaw sap days in each week of the season at Stratford, 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 11; the middle half of seasons fell between Mar 4 and Mar 16. Earliest Feb 13 (2012), latest Apr 18 (1994).
Closing signal
Median Apr 12; middle half between Apr 4 and Apr 17. Earliest Mar 15 (2012), latest Apr 22 (2018).
Sap days by month
Dec16%Jan8%Feb15%Mar31%Apr28%May2%

35 seasons of sap weather

Perth seasons, 1991–2025

The best sap year at Stratford was 2020 with 50 freeze-thaw days; the leanest was 1993 with 16. 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 10 – Apr 13, 31 sap days3120242024: Feb 19 – Mar 26, 33 sap days3320232023: Mar 9 – Apr 10, 36 sap days3620222022: Mar 10 – Apr 11, 37 sap days3720212021: Mar 2 – Apr 4, 28 sap days2820202020: Mar 4 – Apr 7, 50 sap days5020192019: Mar 17 – Apr 17, 36 sap days3620182018: Mar 24 – Apr 22, 34 sap days3420172017: Feb 24 – Mar 29, 27 sap days2720162016: Feb 26 – Mar 31, 44 sap days4420152015: Mar 16 – Apr 9, 27 sap days2720142014: Mar 19 – Apr 19, 23 sap days2320132013: Mar 15 – Apr 12, 29 sap days2920122012: Feb 13 – Mar 15, 38 sap days3820112011: Mar 15 – Apr 19, 19 sap days1920102010: Mar 7 – Mar 31, 22 sap days2220092009: Mar 12 – Apr 16, 35 sap days3520082008: Mar 14 – Apr 16, 25 sap days2520072007: Mar 11 – Apr 14, 18 sap days1820062006: Mar 6 – Apr 10, 26 sap days2620052005: Mar 10 – Apr 13, 23 sap days2320042004: Mar 11 – Apr 13, 23 sap days2320032003: Mar 15 – Apr 13, 23 sap days2320022002: Mar 9 – Apr 10, 35 sap days3520012001: Mar 16 – Apr 19, 23 sap days2320002000: Feb 16 – Mar 20, 26 sap days2619991999: Mar 4 – Mar 30, 36 sap days3619981998: Feb 24 – Mar 25, 23 sap days2319971997: Mar 16 – Apr 19, 26 sap days2619961996: Mar 18 – Apr 19, 27 sap days2719951995: Mar 18 – Apr 10, 32 sap days3219941994: Apr 18 – Apr 18, 21 sap days2119931993: Apr 11 – Apr 18, 16 sap days1619921992: Mar 18 – Apr 16, 24 sap days2419911991: Mar 3 – Apr 4, 28 sap days28
Each bar runs from the season's opening signal to its closing signal, estimated from daily Daymet temperatures at Stratford. Dashed lines mark the typical dates. The right column counts freeze-thaw sap days from December through May.

Maple production

Perth 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 76 in Perth, with 38,554 taps; in 2016, 94 farms and 30,852 taps. Among Ontario's 29 census divisions with a published tap count, Perth ranks 16th, and 80th of the 94 in this atlas.

Over the five years the farm count changed −19% and taps +25%. 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.

Perth maple production, 2016 and 2021 (Statistics Canada, Census of Agriculture)
Census yearFarms reporting tapsTaps
20217638,554E
20169430,852
  • E Statistics Canada quality grade: use with caution.

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 Stratford, the division's most populous municipality in the 2021 Census; the cell sits at 365 m (1,198 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. Ontario 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

Perth sugaring questions

When should I tap maple trees in Perth, Ontario?
In a typical year the sap starts running around March 11 near Stratford and the season winds down around April 12. 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 13 and as late as Apr 18.
How much maple syrup does Perth produce?
Statistics Canada doesn't publish syrup volume by census division. Its 2021 Census of Agriculture counted 76 farms reporting 38,554 maple taps in Perth, number 16 of 29 Ontario divisions with a published count.
How many sap days does Perth get in a season?
On average 28.7 freeze-thaw sap days from December through May at Stratford, of which about 12.3 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 2020 (50 sap days); the leanest was 1993 (16).
Where do these dates come from?
From 35 seasons of daily high and low temperatures at Stratford (Daymet 1-km grid), scored with the same freeze-thaw rule as our live forecast. Ontario 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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