Ruby, AK frost dates
Last spring frostMay 18median date
First fall frostSep 8median date
Growing season113 daysfrost-free
Hardiness zone3aZone 3a
How Ruby compares
- In 8 years out of 10, the last spring frost in Ruby falls between May 8 and June 1, a 24-day window. The first fall frost falls between August 24 and September 23.
- The median last frost is 3 days earlier than the Alaska median of May 21.
- Its 113-day growing season is longer than 39% of the 165 Alaska places with a regular frost season (state median 124 days).
- The weather station records an average of 230 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 8 |
| 50% (median) | May 18 |
| 10% (safe for tender plants) | June 1 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | August 24 |
| 50% (median) | September 8 |
| 90% (late) | September 23 |
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 Ruby, AK
Ruby, AK frost dates — last frost May 18, first frost Sep 8, zone 3a. whenisthelastfrost.com
Crop
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Start indoors: Feb 23 to Mar 9Transplant outside: Apr 20 to May 4
Start indoors: Mar 9 to Mar 23Transplant outside: Jun 1 to Jun 15
Start indoors: Mar 9 to Mar 23Transplant outside: Jun 1 to Jun 15
Start indoors: Mar 23 to Apr 6Transplant outside: May 25 to Jun 8
Start indoors: Mar 23 to Apr 6Transplant outside: Apr 27 to May 11Sow outdoors: Apr 20 to May 25Plant for fall: Jul 14 to Aug 11
Start indoors: Mar 23 to Apr 6Transplant outside: Apr 20 to May 4Sow outdoors: Apr 20 to May 4Plant for fall: Jun 30 to Jul 21
Start indoors: Mar 23 to Apr 6Transplant outside: May 4 to May 18Plant for fall: Jun 2 to Jun 23
Start indoors: Mar 23 to Apr 6Transplant outside: Apr 27 to May 11Plant for fall: Jun 2 to Jun 23
Start indoors: Mar 23 to Apr 6Transplant outside: May 4 to May 18Plant for fall: Jun 2 to Jun 23
Start indoors: Apr 6 to Apr 20Transplant outside: Jun 8 to Jun 22Sow outdoors: Jun 8 to Jun 22
Start indoors: Apr 6 to Apr 20Transplant outside: May 25 to Jun 8
Sow outdoors: Apr 6 to Apr 27Plant for fall: Jun 16 to Jul 7
Sow outdoors: Apr 6 to Apr 27Plant for fall: Jul 14 to Aug 4
Sow outdoors: Apr 13 to May 25Plant for fall: Jul 28 to Aug 18
Start indoors: Apr 20 to Apr 27Transplant outside: Jun 1 to Jun 8Sow outdoors: May 25 to Jun 8Plant for fall: Jun 23 to Jul 7
Start indoors: Apr 20 to Apr 27Sow outdoors: May 25 to Jun 8Plant for fall: Jun 30 to Jul 14
Start indoors: Apr 20 to Apr 27Sow outdoors: May 25 to Jun 8
Start indoors: Apr 20 to Apr 27Transplant outside: Jun 1 to Jun 15
Sow outdoors: Apr 27 to May 25Plant for fall: Jun 16 to Jun 30
Sow outdoors: Apr 27 to May 25Plant for fall: Jun 30 to Jul 14
Sow outdoors: Apr 27 to May 18
Sow outdoors: May 4 to Jun 1Plant for fall: Jun 30 to Jul 14
Sow outdoors: May 4 to May 25Plant for fall: Jul 14 to Aug 4
Sow outdoors: May 25 to Jun 15
Sow outdoors: May 25 to Jun 8
Transplant outside: Jun 1 to Jun 22
Plant for fall: Aug 25 to Sep 29
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Ruby, AK
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 23 – Mar 9 | Apr 20 – May 4 | — | — |
| Peppers | Mar 9 – Mar 23 | Jun 1 – Jun 15 | — | — |
| Eggplant | Mar 9 – Mar 23 | Jun 1 – Jun 15 | — | — |
| Tomatoes | Mar 23 – Apr 6 | May 25 – Jun 8 | — | — |
| Lettuce | Mar 23 – Apr 6 | Apr 27 – May 11 | Apr 20 – May 25 | Jul 14 – Aug 11 |
| Kale | Mar 23 – Apr 6 | Apr 20 – May 4 | Apr 20 – May 4 | Jun 30 – Jul 21 |
| Broccoli | Mar 23 – Apr 6 | May 4 – May 18 | — | Jun 2 – Jun 23 |
| Cabbage | Mar 23 – Apr 6 | Apr 27 – May 11 | — | Jun 2 – Jun 23 |
| Cauliflower | Mar 23 – Apr 6 | May 4 – May 18 | — | Jun 2 – Jun 23 |
| Okra | Apr 6 – Apr 20 | Jun 8 – Jun 22 | Jun 8 – Jun 22 | — |
| Basil | Apr 6 – Apr 20 | May 25 – Jun 8 | — | — |
| Peas | — | — | Apr 6 – Apr 27 | Jun 16 – Jul 7 |
| Spinach | — | — | Apr 6 – Apr 27 | Jul 14 – Aug 4 |
| Radishes | — | — | Apr 13 – May 25 | Jul 28 – Aug 18 |
| Cucumbers | Apr 20 – Apr 27 | Jun 1 – Jun 8 | May 25 – Jun 8 | Jun 23 – Jul 7 |
| Zucchini & Summer Squash | Apr 20 – Apr 27 | — | May 25 – Jun 8 | Jun 30 – Jul 14 |
| Winter Squash & Pumpkins Warning: Your frost-free season is about 113 days, which is tight for winter squash & pumpkins (100+ days). Choose early varieties and use transplants or row covers. | Apr 20 – Apr 27 | — | May 25 – Jun 8 | — |
| Melons & Watermelon | Apr 20 – Apr 27 | Jun 1 – Jun 15 | — | — |
| Carrots | — | — | Apr 27 – May 25 | Jun 16 – Jun 30 |
| Beets | — | — | Apr 27 – May 25 | Jun 30 – Jul 14 |
| Potatoes | — | — | Apr 27 – May 18 | — |
| Swiss Chard | — | — | May 4 – Jun 1 | Jun 30 – Jul 14 |
| Cilantro | — | — | May 4 – May 25 | Jul 14 – Aug 4 |
| Green Beans | — | — | May 25 – Jun 15 | — |
| Sweet Corn | — | — | May 25 – Jun 8 | — |
| Sweet Potatoes Warning: Your frost-free season is about 113 days, which is tight for sweet potatoes (100+ days). Choose early varieties and use transplants or row covers. | — | Jun 1 – Jun 22 | — | — |
| Garlic | — | — | — | Aug 25 – Sep 29 |
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 Galena, AK weather station, 65 km away (elevation 151 ft (46 m)). That is far enough away that your dates may differ, especially if your elevation is different.
Frost dates near Ruby
- Galena May 18 · Sep 8
- Koyukuk May 18 · Sep 8
- Huslia May 18 · Sep 8
- Nulato May 25 · Sep 3
- Hughes May 29 · Aug 28
- Kaltag May 25 · Sep 3
- Tanana May 29 · Aug 28
- Lake Minchumina May 13 · Sep 17
- Takotna May 13 · Sep 13
- Mc Grath May 13 · Sep 13
Frequently asked questions
When is the last frost in Ruby, AK?
The median last spring frost in Ruby, AK is May 18. There is still about a 10% chance of frost after June 1, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Ruby, AK?
The median first fall frost is September 8, with about a 10% chance of frost before August 24.
How long is the growing season in Ruby, AK?
About 113 days between the median last spring frost and first fall frost.
What planting zone is Ruby, AK?
Ruby, AK is in USDA hardiness zone 3a.