Sinclair, ME frost dates
Last spring frostMay 6median date
First fall frostOct 2median date
Growing season149 daysfrost-free
Hardiness zone4aZone 4a
How Sinclair compares
- In 8 years out of 10, the last spring frost in Sinclair falls between April 25 and May 21, a 26-day window. The first fall frost falls between September 18 and October 17.
- The median last frost is the same as the Maine median of May 6.
- Its 149-day growing season is longer than 34% of the 457 Maine places with a regular frost season (state median 154 days).
- The last frost is 6 days earlier than the zone 4a median of May 12. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 4a chart.
- The weather station records an average of 183 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 25 |
| 50% (median) | May 6 |
| 10% (safe for tender plants) | May 21 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 18 |
| 50% (median) | October 2 |
| 90% (late) | October 17 |
Frost here means 32°F (0°C). A median date means half of years have their last frost earlier and half later.
Planting calendar for Sinclair, ME
Sinclair, ME frost dates — last frost May 6, first frost Oct 2, zone 4a. whenisthelastfrost.com
Crop
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Start indoors: Feb 11 to Feb 25Transplant outside: Apr 8 to Apr 22
Start indoors: Feb 25 to Mar 11Transplant outside: May 20 to Jun 3
Start indoors: Feb 25 to Mar 11Transplant outside: May 20 to Jun 3
Start indoors: Mar 11 to Mar 25Transplant outside: May 13 to May 27
Start indoors: Mar 11 to Mar 25Transplant outside: Apr 15 to Apr 29Sow outdoors: Apr 8 to May 13Plant for fall: Aug 7 to Sep 4
Start indoors: Mar 11 to Mar 25Transplant outside: Apr 8 to Apr 22Sow outdoors: Apr 8 to Apr 22Plant for fall: Jul 24 to Aug 14
Start indoors: Mar 11 to Mar 25Transplant outside: Apr 22 to May 6Plant for fall: Jun 26 to Jul 17
Start indoors: Mar 11 to Mar 25Transplant outside: Apr 15 to Apr 29Plant for fall: Jun 26 to Jul 17
Start indoors: Mar 11 to Mar 25Transplant outside: Apr 22 to May 6Plant for fall: Jun 26 to Jul 17
Start indoors: Mar 25 to Apr 8Transplant outside: May 27 to Jun 10Sow outdoors: May 27 to Jun 10
Start indoors: Mar 25 to Apr 8Transplant outside: May 13 to May 27
Sow outdoors: Mar 25 to Apr 15Plant for fall: Jul 10 to Jul 31
Sow outdoors: Mar 25 to Apr 15Plant for fall: Aug 7 to Aug 28
Sow outdoors: Apr 1 to May 13Plant for fall: Aug 21 to Sep 11
Start indoors: Apr 8 to Apr 15Transplant outside: May 20 to May 27Sow outdoors: May 13 to May 27Plant for fall: Jul 17 to Jul 31
Start indoors: Apr 8 to Apr 15Sow outdoors: May 13 to May 27Plant for fall: Jul 24 to Aug 7
Start indoors: Apr 8 to Apr 15Sow outdoors: May 13 to May 27
Start indoors: Apr 8 to Apr 15Transplant outside: May 20 to Jun 3
Sow outdoors: Apr 15 to May 13Plant for fall: Jul 10 to Jul 24
Sow outdoors: Apr 15 to May 13Plant for fall: Jul 24 to Aug 7
Sow outdoors: Apr 15 to May 6
Sow outdoors: Apr 22 to May 20Plant for fall: Jul 24 to Aug 7
Sow outdoors: Apr 22 to May 13Plant for fall: Aug 7 to Aug 28
Sow outdoors: May 13 to Jun 3Plant for fall: Jul 17 to Jul 31
Sow outdoors: May 13 to May 27
Transplant outside: May 20 to Jun 10
Plant for fall: Sep 18 to Oct 23
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Sinclair, ME
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 11 – Feb 25 | Apr 8 – Apr 22 | — | — |
| Peppers | Feb 25 – Mar 11 | May 20 – Jun 3 | — | — |
| Eggplant | Feb 25 – Mar 11 | May 20 – Jun 3 | — | — |
| Tomatoes | Mar 11 – Mar 25 | May 13 – May 27 | — | — |
| Lettuce | Mar 11 – Mar 25 | Apr 15 – Apr 29 | Apr 8 – May 13 | Aug 7 – Sep 4 |
| Kale | Mar 11 – Mar 25 | Apr 8 – Apr 22 | Apr 8 – Apr 22 | Jul 24 – Aug 14 |
| Broccoli | Mar 11 – Mar 25 | Apr 22 – May 6 | — | Jun 26 – Jul 17 |
| Cabbage | Mar 11 – Mar 25 | Apr 15 – Apr 29 | — | Jun 26 – Jul 17 |
| Cauliflower | Mar 11 – Mar 25 | Apr 22 – May 6 | — | Jun 26 – Jul 17 |
| Okra | Mar 25 – Apr 8 | May 27 – Jun 10 | May 27 – Jun 10 | — |
| Basil | Mar 25 – Apr 8 | May 13 – May 27 | — | — |
| Peas | — | — | Mar 25 – Apr 15 | Jul 10 – Jul 31 |
| Spinach | — | — | Mar 25 – Apr 15 | Aug 7 – Aug 28 |
| Radishes | — | — | Apr 1 – May 13 | Aug 21 – Sep 11 |
| Cucumbers | Apr 8 – Apr 15 | May 20 – May 27 | May 13 – May 27 | Jul 17 – Jul 31 |
| Zucchini & Summer Squash | Apr 8 – Apr 15 | — | May 13 – May 27 | Jul 24 – Aug 7 |
| Winter Squash & Pumpkins | Apr 8 – Apr 15 | — | May 13 – May 27 | — |
| Melons & Watermelon | Apr 8 – Apr 15 | May 20 – Jun 3 | — | — |
| Carrots | — | — | Apr 15 – May 13 | Jul 10 – Jul 24 |
| Beets | — | — | Apr 15 – May 13 | Jul 24 – Aug 7 |
| Potatoes | — | — | Apr 15 – May 6 | — |
| Swiss Chard | — | — | Apr 22 – May 20 | Jul 24 – Aug 7 |
| Cilantro | — | — | Apr 22 – May 13 | Aug 7 – Aug 28 |
| Green Beans | — | — | May 13 – Jun 3 | Jul 17 – Jul 31 |
| Sweet Corn | — | — | May 13 – May 27 | — |
| Sweet Potatoes | — | May 20 – Jun 10 | — | — |
| Garlic | — | — | — | Sep 18 – Oct 23 |
Dates come from the median frost dates and common extension-service timing. Adjust for your soil temperature, microclimate and the varieties you grow.
About these dates
Based on 1991–2020 NOAA climate normals for the Frenchville Aroostook Ap, ME weather station, 18 km away (elevation 988 ft (301 m)).
Frost dates near Sinclair
- Saint Agatha May 6 · Oct 2
- Stockholm May 23 · Sep 26
- Frenchville May 6 · Oct 2
- Wallagrass May 23 · Sep 24
- Madawaska May 6 · Oct 2
- Fort Kent Mills May 23 · Sep 24
- Grand Isle May 6 · Oct 2
- New Sweden May 7 · Oct 1
- Saint David May 6 · Oct 2
- Fort Kent May 23 · Sep 24
Frequently asked questions
When is the last frost in Sinclair, ME?
The median last spring frost in Sinclair, ME is May 6. There is still about a 10% chance of frost after May 21, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Sinclair, ME?
The median first fall frost is October 2, with about a 10% chance of frost before September 18.
How long is the growing season in Sinclair, ME?
About 149 days between the median last spring frost and first fall frost.
What planting zone is Sinclair, ME?
Sinclair, ME is in USDA hardiness zone 4a.