WhenToBird

Sterna hirundo · Laridae

When Do Common Terns Arrive in South Carolina?

Adult Common Tern
Photo: Сергей Неклюдов, CC BY 4.0 via iNaturalist

Common Terns arrive in South Carolina in late March, peak in mid August (1.5% of checklists), and most are gone by mid October.

When to look

First arrivalsMar 22-31late March
Common byMar 22-31late March
PeakAug 15-21mid August
Most gone byOct 15-21mid October

Best: mid August. First arrivals late March; most are gone by mid October. Peak: on about 1.5% of South Carolina checklists.

  1. Jannot usually seen
  2. Febnot usually seen
  3. Maruncommon
  4. Aprcommon
  5. Mayuncommon
  6. Juncommon
  7. Julpeak season
  8. Augpeak season
  9. Seppeak season
  10. Octcommon
  11. Novrare
  12. Decnot usually seen

Darker months: more checklists report it. Outlined: peak month.

0%0.5%1%1.5%2%Jan 1-7: 0% of 15487 checklistsJan 8-14: 0% of 11691 checklistsJan 15-21: 0% of 11994 checklistsJan 22-31: 0% of 16225 checklistsFeb 1-7: 0% of 12192 checklistsFeb 8-14: 0% of 14044 checklistsFeb 15-21: 0% of 18483 checklistsFeb 22-28: 0% of 12045 checklistsMar 1-7: 0% of 11511 checklistsMar 8-14: 0% of 11704 checklistsMar 15-21: 0.1% of 11526 checklistsMar 22-31: 0.5% of 17386 checklistsApr 1-7: 0.7% of 13148 checklistsApr 8-14: 0.8% of 13193 checklistsApr 15-21: 0.7% of 13936 checklistsApr 22-30: 0.4% of 19002 checklistsMay 1-7: 0.4% of 14133 checklistsMay 8-14: 0.4% of 13668 checklistsMay 15-21: 0.5% of 11064 checklistsMay 22-31: 0.5% of 14461 checklistsJun 1-7: 0.8% of 10231 checklistsJun 8-14: 0.8% of 9417 checklistsJun 15-21: 0.9% of 8012 checklistsJun 22-30: 0.8% of 9720 checklistsJul 1-7: 0.7% of 7907 checklistsJul 8-14: 0.9% of 7338 checklistsJul 15-21: 0.9% of 7312 checklistsJul 22-31: 1.2% of 10877 checklistsAug 1-7: 1.4% of 7816 checklistsAug 8-14: 1.5% of 7655 checklistsAug 15-21: 1.6% of 7797 checklistsAug 22-31: 1.4% of 11246 checklistsSep 1-7: 1.3% of 8956 checklistsSep 8-14: 1.3% of 8929 checklistsSep 15-21: 1.1% of 9389 checklistsSep 22-30: 0.9% of 13028 checklistsOct 1-7: 0.5% of 11063 checklistsOct 8-14: 0.5% of 10968 checklistsOct 15-21: 0.4% of 10264 checklistsOct 22-31: 0.4% of 12917 checklistsNov 1-7: 0.1% of 8802 checklistsNov 8-14: 0.1% of 8339 checklistsNov 15-21: 0% of 8798 checklistsNov 22-30: 0% of 12925 checklistsDec 1-7: 0% of 8541 checklistsDec 8-14: 0% of 8609 checklistsDec 15-21: 0% of 9961 checklistsDec 22-31: 0% of 17541 checklistsJanFebMarAprMayJunJulAugSepOctNovDec
Share of complete checklists reporting it, by week (4 per month). Grey bars: fewer than 10 checklists, not counted.

Frequency is the share of complete checklists in South Carolina that listed the bird, 2016–2025. It is not a head count, and it follows where and when people go birding. How to read it.

JanFebMarAprMayJunJulAugSepOctNovDec
today
Second week of November

Each county is shaded by the share of complete checklists there that listed the bird, blended with the weeks either side. Darker is more often. It follows where people watch birds, not how many birds there are. How to read it.

Embed this map on your site

Where in South Carolina

Best counties

Share of checklists at the peak
  1. Georgetown CountyBest early July · 387 checklists that week, 32,234 in all6.5%
  2. Colleton CountyBest late August · 90 checklists that week, 8,909 in all6.1%
  3. Beaufort CountyBest the second week of August · 780 checklists that week, 60,298 in all4.2%
  4. Horry CountyBest late August · 549 checklists that week, 27,518 in all3.6%
  5. Charleston CountyBest early September · 1689 checklists that week, 102,218 in all3.3%
  6. Jasper CountyBest mid August · 216 checklists that week, 12,443 in all0.9%

Best spots

Share of checklists at the peak
  1. Huntington Beach State Park (Murrells Inlet)Georgetown County, best early August · 27 checklists that week, 1,488 in all43%
  2. Litchfield SpitGeorgetown County, best the second week of July · 22 checklists that week, 227 in all34%
  3. Lighthouse Inlet Heritage PreserveCharleston County, best mid August · 20 checklists that week, 1,859 in all34%
  4. Hunting Island State ParkBeaufort County, best mid June · 22 checklists that week, 641 in all30%

Busy spots report more of everything; compare the checklist counts before you drive anywhere.

Best time of day

In South Carolina, the Common Tern is most often listed on checklists started between 6 and 8 am (0.6% of those checklists).

0%0.5%1%12 am: too few checklists (222) to judge1 am: too few checklists (160) to judge2 am: too few checklists (132) to judge3 am: too few checklists (212) to judge4 am: too few checklists (267) to judge5 am: too few checklists (1898) to judge6 am: 0.8% of 19280 checklists7 am: 0.5% of 66492 checklists8 am: 0.5% of 73941 checklists9 am: 0.4% of 63039 checklists10 am: 0.4% of 52652 checklists11 am: 0.4% of 41908 checklists12 pm: 0.4% of 36782 checklists1 pm: 0.4% of 33300 checklists2 pm: 0.4% of 32248 checklists3 pm: 0.4% of 35451 checklists4 pm: 0.4% of 34410 checklists5 pm: 0.4% of 27073 checklists6 pm: 0.5% of 17375 checklists7 pm: too few checklists (10313) to judge8 pm: too few checklists (2756) to judge9 pm: too few checklists (672) to judge10 pm: too few checklists (412) to judge11 pm: too few checklists (256) to judge12a3a6a9a12p3p6p9p
Share of checklists started in each local hour that reported it. It reflects when people go birding as well as when birds are active. Grey hours have too few checklists (under 2% of the state’s, or under 200) to judge.
Week-by-week table
MonthDays 1-78-1415-2122-end
January0%0%0%0%
February0%0%0%0%
March0%0%0.1%0.5%
April0.7%0.8%0.7%0.4%
May0.4%0.4%0.5%0.5%
June0.8%0.8%0.9%0.8%
July0.7%0.9%0.9%1.2%
August1.4%1.5%1.6%1.4%
September1.3%1.3%1.1%0.9%
October0.5%0.5%0.4%0.4%
November0.1%0.1%0%0%
December0%0%0%0%

Neighboring states

  • North Carolina: arrives the second week of May, 6 weeks later than South Carolina
  • Virginia: arrives early May, 5 weeks later than South Carolina
  • Alabama: arrives late April, 4 weeks later than South Carolina
  • Florida: arrives mid May, 7 weeks later than South Carolina

Common questions

When do Common Terns arrive in South Carolina?
Common Terns arrive in South Carolina in late March, peak in mid August (1.5% of checklists), and most are gone by mid October.
When do Common Terns leave South Carolina?
Most Common Terns have left South Carolina by mid October, when reports fall below half their usual rate.
When is the best time to see a Common Tern in South Carolina?
The Common Tern is reported most often in mid August, on about 1.5% of South Carolina checklists.
Where in South Carolina are Common Terns seen most often?
By county, Georgetown County, Colleton County, and Beaufort County have the highest peak reporting rates for the Common Tern (counties with at least 200 checklists).