| 100% | INIT | 4 | Ltr. with a period |
| 69% | PUBERTY | 7 | Period with a period, maybe |
| 69% | STPAUL | 6 | Only state capital written with a period |
| 68% | JCREW | 5 | Clothing retailer with a period in its name |
| 68% | ENCL | 4 | Insertion with a ltr. |
| 67% | SENTENCE | 8 | It ends with a period or with jail time |
| 67% | SASE | 4 | Enclosure with a bus. ltr. |
| 67% | PICASSO | 7 | Painter with a Blue Period |
| 65% | ANO | 3 | Period with a tilde? |
| 65% | ERA | 3 | Period with a name |
| 65% | AOL | 3 | Internet service provider whose name is now stylized with a period |
| 65% | TEXTS | 5 | Messages that, to some, sound angrier when punctuated with a period |
| 65% | ENCL | 4 | Check sent with a ltr., e.g. |
| 64% | ORCA | 4 | Creature with a 17-month gestation period |
| 64% | MONACO | 6 | Country with a 26-year Grace period? |
| 64% | WORKSHIFT | 9 | Period with a lunch break |
| 64% | LEAPYEAR | 8 | Period with a February 29 |
| 63% | IDES | 4 | Period associated with tossing a Caesar? |
| 62% | DACA | 4 | Immigration program with a two-year renewal period, familiarly |
| 62% | LEAPYEAR | 8 | Period with a February 29th (2 wds.) |
| 62% | LEAPYEAR | 8 | Period with a February 29 (2 wds.) |
| 61% | ERA | 3 | Period often with a name |
| 61% | CATGAP | 6 | Period with a noticeable lack of feline fossils |
| 60% | ERA | 3 | Period associated with a president, perhaps |
| 59% | BABYBOOM | 8 | Period with a significant rise in the birth rate |
| 59% | SIT | 3 | With 13-Across, observe a seven-day mourning period |
| 59% | ERA | 3 | Time period with a name |
| 59% | POINT | 5 | *Indicate with a finger or period that comes after 18a in Pi |
| 58% | ERA | 3 | Period of history with a characteristic |
| 58% | ERA | 3 | Historic period with a distinct feel |