| 100% | NEWERA | 6 | Period that's "ushered in" |
| 81% | NEWERA | 6 | Period of change that's "ushered in" |
| 68% | DST | 3 | Period that ends in November: Abbr. |
| 68% | ERA | 3 | Time period that's often the savior of many crossword constructors (as in this instance) |
| 68% | ERAS | 4 | Periods that historians might specialize in |
| 64% | PAXROMANA | 9 | Period ushered in by Augustus |
| 63% | SPACEAGE | 8 | Time period that began with Sputnik in 1957 |
| 63% | IRONAGE | 7 | Historical period that saw a rise in steelmaking |
| 62% | BIDEN | 5 | With 10-Across, period that started in January 2021 |
| 62% | OBAMA | 5 | With 23-Across, period that began in January 2009 |
| 60% | PLURAL | 6 | Word that ends in S, often |
| 60% | LENT | 4 | Christian observance period that will begin on March 6 in 2019 |
| 59% | LULL | 4 | Period that's not bustling with activity |
| 59% | POINT | 5 | *Indicate with a finger or period that comes after 18a in Pi |
| 58% | ROUGHPATCH | 10 | Time period that's not easy |
| 57% | EAU | 3 | That's in Seine! |
| 57% | OMER | 4 | Seven-week period in Judaism that begins during Passover |
| 57% | SHIRT | 5 | Something that comes in S, M, L, XL, etc. |
| 56% | ESO | 3 | That's "that" in Tijuana |
| 56% | NEWERA | 6 | Period "ushered in" |
| 56% | ERA | 3 | Anagram of 26-Across, that means a period in time |
| 56% | PARASOL | 7 | Sunlight-protecting umbrella that is often seen in period dramas |
| 56% | WIG | 3 | Fake hairpiece that is often used in period drama costumes |
| 56% | BOYS | 4 | Song by Lizzo that featured in the period drama "Dickinson" |
| 56% | KFC | 3 | Fast-food franchise that started in S. Salt Lake, Ut. |
| 56% | ESPOO | 5 | City in S Finland that houses the Gallen-Kallela Museum |
| 56% | ERA | 3 | Time period that's often given a name |
| 55% | NAIL | 4 | Fastener that's hammered in |
| 55% | SCREW | 5 | Fastener that's twisted in |
| 55% | SUNSHINE | 8 | Light that's basked in |