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Ohio · county maple atlas

Maple sugaring in Seneca County, Ohio

Seneca County had 8 maple operations and 6,100 taps in the 2022 Census. Around Tiffin, sap usually runs from February 20 to March 26. Here's the long-run pattern, 36 seasons of sap weather, and the outlook this week.
Too early to tapAbout 137 days until the usual start.
Sap starts
Feb 20
typical year
Season ends
Mar 26
about 5 weeks
Sap days / season
37.2
1991–2026 average
Taps, 2022
6,100
#15 of 63 in OH

Sap-flow outlook at Tiffin right now

Full Ohio forecast →

Forecast for Tiffin, OH

Updated Oct 6, 3:46 AM EDT

Off-season for now. Sap needs freezing nights, and none are in sight. Seneca County's season usually opens around February 20, which is 137 days away.

No freeze-thaw days in the forecast

freeze thaw 32°F

  1. WedOct 7
    48° / 77°

    0h below · 24h above

    No refreeze forecast
  2. ThuOct 8
    50° / 71°

    0h below · 24h above

    No refreeze forecast
  3. FriOct 9
    43° / 70°

    0h below · 24h above

    No refreeze forecast
  4. SatOct 10
    46° / 75°

    0h below · 24h above

    No refreeze forecast
  5. SunOct 11
    54° / 74°

    0h below · 24h above

    No refreeze forecast
  6. MonOct 12
    54° / 76°
    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 Tiffin

Freeze-thaw weather at Tiffin peaks in the weeks of Feb 2 to Apr 6, which hold about 59% of a season's sap days. March is the busiest month.
Typical season: Feb 20 – Mar 260246Week of Dec 1: 1.8 sap days on averageWeek of Dec 8: 2.1 sap days on averageWeek of Dec 15: 2.0 sap days on averageWeek of Dec 22: 1.8 sap days on averageWeek of Dec 29: 1.3 sap days on averageWeek of Jan 5: 1.3 sap days on averageWeek of Jan 12: 1.2 sap days on averageWeek of Jan 19: 1.1 sap days on averageWeek of Jan 26: 1.6 sap days on averageWeek of Feb 2: 1.9 sap days on averageWeek of Feb 9: 1.9 sap days on averageWeek of Feb 16: 2.1 sap days on averageWeek of Feb 23: 2.3 sap days on averageWeek of Mar 2: 2.6 sap days on averageWeek of Mar 9: 2.6 sap days on averageWeek of Mar 16: 2.7 sap days on averageWeek of Mar 23: 2.4 sap days on averageWeek of Mar 30: 1.8 sap days on averageWeek of Apr 6: 1.8 sap days on averageWeek of Apr 13: 0.5 sap days on averageWeek of Apr 20: 0.3 sap days on averageWeek of Apr 27: 0.1 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 ~Feb 20
Average number of freeze-thaw sap days in each week of the season at Tiffin, 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 Feb 15; the middle half of seasons fell between Feb 4 and Feb 23. Earliest Jan 22 (1998), latest Mar 8 (2003).
Closing signal
Median Mar 16; middle half between Mar 7 and Mar 28. Earliest Feb 18 (2017), latest Apr 6 (2014).
Sap days by month
Dec22%Jan15%Feb22%Mar30%Apr10%May0%

36 seasons of sap weather

Seneca County seasons, 1991–2026

The best sap year at Tiffin was 1999 with 53 freeze-thaw days; the leanest was 2003 with 22. 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: Feb 10 – Mar 3, 36 sap days3620252025: Feb 11 – Mar 17, 39 sap days3920242024: Feb 4 – Feb 26, 38 sap days3820232023: Jan 25 – Feb 19, 38 sap days3820222022: Feb 12 – Mar 14, 45 sap days4520212021: Feb 15 – Mar 21, 36 sap days3620202020: Feb 4 – Mar 9, 44 sap days4420192019: Feb 21 – Mar 28, 43 sap days4320182018: Jan 26 – Feb 18, 52 sap days5220172017: Jan 31 – Feb 18, 29 sap days2920162016: Feb 4 – Mar 7, 43 sap days4320152015: Mar 3 – Apr 4, 28 sap days2820142014: Mar 5 – Apr 6, 29 sap days2920132013: Mar 3 – Apr 4, 43 sap days4320122012: Feb 5 – Mar 12, 46 sap days4620112011: Feb 15 – Mar 15, 22 sap days2220102010: Mar 3 – Mar 28, 22 sap days2220092009: Feb 14 – Mar 21, 39 sap days3920082008: Feb 25 – Mar 31, 35 sap days3520072007: Feb 17 – Mar 21, 31 sap days3120062006: Feb 3 – Mar 8, 36 sap days3620052005: Feb 22 – Mar 27, 30 sap days3020042004: Feb 19 – Mar 25, 34 sap days3420032003: Mar 8 – Mar 15, 22 sap days2220022002: Feb 1 – Mar 6, 41 sap days4120012001: Feb 28 – Apr 4, 36 sap days3620002000: Jan 29 – Mar 5, 36 sap days3619991999: Feb 22 – Mar 28, 53 sap days5319981998: Jan 22 – Feb 25, 41 sap days4119971997: Feb 17 – Mar 13, 43 sap days4319961996: Feb 19 – Mar 25, 38 sap days3819951995: Feb 15 – Mar 11, 38 sap days3819941994: Feb 25 – Mar 31, 35 sap days3519931993: Mar 4 – Apr 4, 34 sap days3419921992: Jan 31 – Mar 2, 45 sap days4519911991: Feb 14 – Mar 17, 40 sap days40
Each bar runs from the season's opening signal to its closing signal, estimated from daily temperatures at Tiffin. Dashed lines mark the typical dates. The right column counts freeze-thaw sap days from December through May.

Maple production

Seneca County in the Census of Agriculture

USDA counts maple operations every five years. In Seneca County the 2022 Census found 8 farms making syrup (-11% since 2017), with taps +204% and syrup output +376% over the same five years. That works out to about 0.22 gallons of syrup per tap in 2022 (0.14 in 2017). Among the 385 counties in this atlas, Seneca County ranks 175 by taps.

Seneca County maple production, 2017 and 2022 (USDA Census of Agriculture)
Census yearFarmsTapsGallons of syrupGal / tap
202286,1001,3340.22
201792,0052800.14

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 Tiffin (741ft), 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 Ohio's USDA record (8 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 — Ohio, 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

Seneca County sugaring questions

When should I tap maple trees in Seneca County, Ohio?
In a typical year the sap starts running around February 20 near Tiffin and the season winds down around March 26. 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 Jan 22 and as late as Mar 8.
How much maple syrup does Seneca County produce?
The 2022 Census of Agriculture counted 8 maple operations in Seneca County with 6,100 taps producing 1,334 gallons of syrup, ranking 15 of 63 Ohio's counties with published tap counts.
How many sap days does Seneca County get in a season?
On average 37.2 freeze-thaw sap days from December through May at Tiffin, of which about 14.1 are textbook days with a night in the 20s and a day in the 40s. The best season since 1991 was 1999 (53 sap days); the leanest was 2003 (22).
Where do these dates come from?
From 36 seasons of daily high and low temperatures at Tiffin (PRISM 4-km grid), scored with the same freeze-thaw rule as our live forecast, then calibrated against USDA's reported season dates for Ohio. 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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