Hammond, OR frost dates
Last spring frostMar 26median date
First fall frostNov 11median date
Growing season230 daysfrost-free
Hardiness zone9aZone 9a
How Hammond compares
- In 8 years out of 10, the last spring frost in Hammond falls between February 27 and April 18, a 50-day window. The first fall frost falls between October 22 and December 8.
- The median last frost is 21 days earlier than the Oregon median of Apr 16.
- Its 230-day growing season is longer than 77% of the 345 Oregon places with a regular frost season (state median 193 days).
- The last frost is 23 days later than the zone 9a median of Mar 3. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 9a chart.
- The weather station records an average of 29 nights a year at or below 32°F.
- Compared with Hillsboro, OR, 107 km away, the last frost here is 21 days earlier than there and the growing season is 40 days longer.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | February 27 |
| 50% (median) | March 26 |
| 10% (safe for tender plants) | April 18 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 22 |
| 50% (median) | November 11 |
| 90% (late) | December 8 |
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 Hammond, OR
Hammond, OR frost dates — last frost Mar 26, first frost Nov 11, zone 9a. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Jan 1 to Jan 15Transplant outside: Feb 26 to Mar 12
Start indoors: Jan 15 to Jan 29Transplant outside: Apr 9 to Apr 23
Start indoors: Jan 15 to Jan 29Transplant outside: Apr 9 to Apr 23
Start indoors: Jan 29 to Feb 12Transplant outside: Apr 2 to Apr 16
Start indoors: Jan 29 to Feb 12Transplant outside: Mar 5 to Mar 19Sow outdoors: Feb 26 to Apr 2Plant for fall: Sep 16 to Oct 14
Start indoors: Jan 29 to Feb 12Transplant outside: Feb 26 to Mar 12Sow outdoors: Feb 26 to Mar 12Plant for fall: Sep 2 to Sep 23
Start indoors: Jan 29 to Feb 12Transplant outside: Mar 12 to Mar 26Plant for fall: Aug 5 to Aug 26
Start indoors: Jan 29 to Feb 12Transplant outside: Mar 5 to Mar 19Plant for fall: Aug 5 to Aug 26
Start indoors: Jan 29 to Feb 12Transplant outside: Mar 12 to Mar 26Plant for fall: Aug 5 to Aug 26
Start indoors: Feb 12 to Feb 26Transplant outside: Apr 16 to Apr 30Sow outdoors: Apr 16 to Apr 30
Start indoors: Feb 12 to Feb 26Transplant outside: Apr 2 to Apr 16
Sow outdoors: Feb 12 to Mar 5Plant for fall: Aug 19 to Sep 9
Sow outdoors: Feb 12 to Mar 5Plant for fall: Sep 16 to Oct 7
Sow outdoors: Feb 19 to Apr 2Plant for fall: Sep 30 to Oct 21
Start indoors: Feb 26 to Mar 5Transplant outside: Apr 9 to Apr 16Sow outdoors: Apr 2 to Apr 16Plant for fall: Aug 26 to Sep 9
Start indoors: Feb 26 to Mar 5Sow outdoors: Apr 2 to Apr 16Plant for fall: Sep 2 to Sep 16
Start indoors: Feb 26 to Mar 5Sow outdoors: Apr 2 to Apr 16
Start indoors: Feb 26 to Mar 5Transplant outside: Apr 9 to Apr 23
Sow outdoors: Mar 5 to Apr 2Plant for fall: Aug 19 to Sep 2
Sow outdoors: Mar 5 to Apr 2Plant for fall: Sep 2 to Sep 16
Sow outdoors: Mar 5 to Mar 26
Sow outdoors: Mar 12 to Apr 9Plant for fall: Sep 2 to Sep 16
Sow outdoors: Mar 12 to Apr 2Plant for fall: Sep 16 to Oct 7
Sow outdoors: Apr 2 to Apr 23Plant for fall: Aug 26 to Sep 9
Sow outdoors: Apr 2 to Apr 16
Transplant outside: Apr 9 to Apr 30
Plant for fall: Oct 28 to Dec 2
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Hammond, OR
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 1 – Jan 15 | Feb 26 – Mar 12 | — | — |
| Peppers | Jan 15 – Jan 29 | Apr 9 – Apr 23 | — | — |
| Eggplant | Jan 15 – Jan 29 | Apr 9 – Apr 23 | — | — |
| Tomatoes | Jan 29 – Feb 12 | Apr 2 – Apr 16 | — | — |
| Lettuce | Jan 29 – Feb 12 | Mar 5 – Mar 19 | Feb 26 – Apr 2 | Sep 16 – Oct 14 |
| Kale | Jan 29 – Feb 12 | Feb 26 – Mar 12 | Feb 26 – Mar 12 | Sep 2 – Sep 23 |
| Broccoli | Jan 29 – Feb 12 | Mar 12 – Mar 26 | — | Aug 5 – Aug 26 |
| Cabbage | Jan 29 – Feb 12 | Mar 5 – Mar 19 | — | Aug 5 – Aug 26 |
| Cauliflower | Jan 29 – Feb 12 | Mar 12 – Mar 26 | — | Aug 5 – Aug 26 |
| Okra | Feb 12 – Feb 26 | Apr 16 – Apr 30 | Apr 16 – Apr 30 | — |
| Basil | Feb 12 – Feb 26 | Apr 2 – Apr 16 | — | — |
| Peas | — | — | Feb 12 – Mar 5 | Aug 19 – Sep 9 |
| Spinach | — | — | Feb 12 – Mar 5 | Sep 16 – Oct 7 |
| Radishes | — | — | Feb 19 – Apr 2 | Sep 30 – Oct 21 |
| Cucumbers | Feb 26 – Mar 5 | Apr 9 – Apr 16 | Apr 2 – Apr 16 | Aug 26 – Sep 9 |
| Zucchini & Summer Squash | Feb 26 – Mar 5 | — | Apr 2 – Apr 16 | Sep 2 – Sep 16 |
| Winter Squash & Pumpkins | Feb 26 – Mar 5 | — | Apr 2 – Apr 16 | — |
| Melons & Watermelon | Feb 26 – Mar 5 | Apr 9 – Apr 23 | — | — |
| Carrots | — | — | Mar 5 – Apr 2 | Aug 19 – Sep 2 |
| Beets | — | — | Mar 5 – Apr 2 | Sep 2 – Sep 16 |
| Potatoes | — | — | Mar 5 – Mar 26 | — |
| Swiss Chard | — | — | Mar 12 – Apr 9 | Sep 2 – Sep 16 |
| Cilantro | — | — | Mar 12 – Apr 2 | Sep 16 – Oct 7 |
| Green Beans | — | — | Apr 2 – Apr 23 | Aug 26 – Sep 9 |
| Sweet Corn | — | — | Apr 2 – Apr 16 | — |
| Sweet Potatoes | — | Apr 9 – Apr 30 | — | — |
| Garlic | — | — | — | Oct 28 – Dec 2 |
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 Astoria Rgnl Ap, OR weather station, 7 km away (elevation 10 ft (3 m)).
Frost dates near Hammond
- Warrenton Mar 26 · Nov 11
- Astoria Mar 26 · Nov 11
- Seaside Apr 2 · Nov 12
- Cannon Beach Apr 2 · Nov 12
- Tolovana Park Apr 2 · Nov 12
- Arch Cape Apr 2 · Nov 12
- Nehalem Apr 2 · Nov 12
- Manzanita Apr 2 · Nov 12
- Wheeler Apr 22 · Oct 21
- Clatskanie Apr 24 · Oct 24
Frequently asked questions
When is the last frost in Hammond, OR?
The median last spring frost in Hammond, OR is March 26. There is still about a 10% chance of frost after April 18, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Hammond, OR?
The median first fall frost is November 11, with about a 10% chance of frost before October 22.
How long is the growing season in Hammond, OR?
About 230 days between the median last spring frost and first fall frost.
What planting zone is Hammond, OR?
Hammond, OR is in USDA hardiness zone 9a.