Skip to content
LuckySap
Get the app
Indiana · county maple atlas

Maple sugaring in Carroll County, Indiana

Carroll County had 7 maple operations and 1,590 taps in the 2022 Census. Around Delphi, sap usually runs from February 7 to March 9. Here's the long-run pattern, 36 seasons of sap weather, and the outlook this week.
Too early to tapAbout 124 days until the usual start.
Sap starts
Feb 7
typical year
Season ends
Mar 9
about 4 weeks
Sap days / season
39.7
1991–2026 average
Taps, 2022
1,590
#12 of 42 in IN

Sap-flow outlook at Delphi right now

Full Indiana forecast →

Forecast for Delphi, IN

Updated Oct 6, 10:45 AM EDT

Off-season for now. Sap needs freezing nights, and none are in sight. Carroll County's season usually opens around February 7, which is 124 days away.

No freeze-thaw days in the forecast

freeze thaw 32°F

  1. WedOct 7
    52° / 80°

    0h below · 24h above

    No refreeze forecast
  2. ThuOct 8
    51° / 71°

    0h below · 24h above

    No refreeze forecast
  3. FriOct 9
    45° / 72°

    0h below · 24h above

    No refreeze forecast
  4. SatOct 10
    50° / 81°

    0h below · 24h above

    No refreeze forecast
  5. SunOct 11
    57° / 79°

    0h below · 24h above

    No refreeze forecast
  6. MonOct 12
    56° / 80°
    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 Delphi

Freeze-thaw weather at Delphi peaks in the weeks of Feb 2 to Mar 30, which hold about 55% of a season's sap days. March is the busiest month.
Typical season: Feb 7 – Mar 90246Week of Dec 1: 2.1 sap days on averageWeek of Dec 8: 2.1 sap days on averageWeek of Dec 15: 2.2 sap days on averageWeek of Dec 22: 1.9 sap days on averageWeek of Dec 29: 1.5 sap days on averageWeek of Jan 5: 1.4 sap days on averageWeek of Jan 12: 1.4 sap days on averageWeek of Jan 19: 1.2 sap days on averageWeek of Jan 26: 1.6 sap days on averageWeek of Feb 2: 2.1 sap days on averageWeek of Feb 9: 2.1 sap days on averageWeek of Feb 16: 2.3 sap days on averageWeek of Feb 23: 2.4 sap days on averageWeek of Mar 2: 2.8 sap days on averageWeek of Mar 9: 2.6 sap days on averageWeek of Mar 16: 3.0 sap days on averageWeek of Mar 23: 2.5 sap days on averageWeek of Mar 30: 2.1 sap days on averageWeek of Apr 6: 1.4 sap days on averageWeek of Apr 13: 0.7 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: 0.0 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 7
Average number of freeze-thaw sap days in each week of the season at Delphi, 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 11; the middle half of seasons fell between Feb 3 and Feb 18. Earliest Jan 15 (2017), latest Mar 4 (2014).
Closing signal
Median Mar 14; middle half between Mar 6 and Mar 20. Earliest Feb 15 (1998), latest Apr 6 (2014).
Sap days by month
Dec23%Jan15%Feb22%Mar30%Apr10%May0%

36 seasons of sap weather

Carroll County seasons, 1991–2026

The best sap year at Delphi was 2018 with 62 freeze-thaw days; the leanest was 2010 with 21. 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 9 – Mar 3, 32 sap days3220252025: Feb 7 – Mar 9, 33 sap days3320242024: Feb 3 – Mar 3, 39 sap days3920232023: Jan 19 – Feb 20, 44 sap days4420222022: Feb 12 – Mar 14, 39 sap days3920212021: Feb 13 – Mar 20, 36 sap days3620202020: Feb 4 – Mar 9, 41 sap days4120192019: Feb 19 – Mar 26, 45 sap days4520182018: Jan 25 – Feb 27, 62 sap days6220172017: Jan 15 – Feb 17, 36 sap days3620162016: Feb 3 – Mar 6, 38 sap days3820152015: Feb 26 – Mar 30, 32 sap days3220142014: Mar 4 – Apr 6, 35 sap days3520132013: Mar 2 – Apr 5, 45 sap days4520122012: Feb 1 – Mar 7, 49 sap days4920112011: Feb 13 – Mar 20, 34 sap days3420102010: Feb 28 – Mar 9, 21 sap days2120092009: Feb 9 – Mar 15, 39 sap days3920082008: Feb 14 – Mar 21, 38 sap days3820072007: Feb 14 – Mar 19, 37 sap days3720062006: Jan 19 – Feb 23, 45 sap days4520052005: Feb 12 – Mar 18, 33 sap days3320042004: Feb 25 – Mar 20, 38 sap days3820032003: Feb 19 – Mar 15, 32 sap days3220022002: Feb 1 – Mar 6, 51 sap days5120012001: Feb 24 – Mar 28, 34 sap days3420002000: Jan 29 – Mar 5, 45 sap days4519991999: Feb 12 – Mar 19, 44 sap days4419981998: Jan 26 – Feb 15, 43 sap days4319971997: Feb 3 – Mar 10, 44 sap days4419961996: Feb 9 – Mar 14, 46 sap days4619951995: Feb 9 – Mar 11, 44 sap days4419941994: Feb 17 – Mar 20, 34 sap days3419931993: Feb 25 – Mar 20, 39 sap days3919921992: Jan 28 – Mar 2, 45 sap days4519911991: Feb 14 – Mar 16, 38 sap days38
Each bar runs from the season's opening signal to its closing signal, estimated from daily temperatures at Delphi. Dashed lines mark the typical dates. The right column counts freeze-thaw sap days from December through May.

Maple production

Carroll County in the Census of Agriculture

USDA counts maple operations every five years. In Carroll County the 2022 Census found 7 farms making syrup (0% since 2017), with taps +50% and syrup output +177% over the same five years. That works out to about 0.25 gallons of syrup per tap in 2022 (0.14 in 2017). Among the 385 counties in this atlas, Carroll County ranks 263 by taps.

Carroll County maple production, 2017 and 2022 (USDA Census of Agriculture)
Census yearFarmsTapsGallons of syrupGal / tap
202271,5904040.25
201771,0601460.14

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 Delphi (574ft), 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 Indiana's USDA record (3 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 — Indiana, 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

Carroll County sugaring questions

When should I tap maple trees in Carroll County, Indiana?
In a typical year the sap starts running around February 7 near Delphi and the season winds down around March 9. 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 15 and as late as Mar 4.
How much maple syrup does Carroll County produce?
The 2022 Census of Agriculture counted 7 maple operations in Carroll County with 1,590 taps producing 404 gallons of syrup, ranking 12 of 42 Indiana's counties with published tap counts.
How many sap days does Carroll County get in a season?
On average 39.7 freeze-thaw sap days from December through May at Delphi, of which about 14.4 are textbook days with a night in the 20s and a day in the 40s. The best season since 1991 was 2018 (62 sap days); the leanest was 2010 (21).
Where do these dates come from?
From 36 seasons of daily high and low temperatures at Delphi (PRISM 4-km grid), scored with the same freeze-thaw rule as our live forecast, then calibrated against USDA's reported season dates for Indiana. They describe a typical year at one point in the county; your sugarbush, slope and elevation can shift them by days.

LuckySap · free on iPhone & Android

Get a heads-up when the sap will run in Carroll County

LuckySap watches the forecast for your trees and can ping you the night before a strong sap day, then keeps every collection and boil in one season log. Free on iPhone and Android.

Download on the App StoreGet it on Google Play