Frost dates for ZIP 99669 (Kalifornsky, AK)
Average last spring and first fall frost dates with 10%, 50% and 90% odds, from NOAA's 1991–2020 climate normals for the nearest weather station, Soldotna 5SSW, AK (6 miles away).
- Average last spring frostJun 1150% chance of a 32°F freeze after this date
- Average first fall frostSep 150% chance of a 32°F freeze by this date
- Growing season (frost-free)75 daysmedian, 32°F threshold
- USDA hardiness zone4b-25 to -20°F avg. coldest night
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This week in your yard
As of Oct 17, 2026, from your frost dates, zone and soil temperature. Lawn timing · Vegetables · Pruning · Plants
Soil temperature now
2-inch depth
39°F Below 50°F
24-hour average · latest 41°F, as of Oct 17, 10:00 PM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Kenai 29 ENE (32 mi), Moose Inc (48 mi).
4-inch depth
40°F Below 50°F
24-hour average · latest 41°F, as of Oct 17, 9:00 PM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Kenai 29 ENE (32 mi).
Fall: Texas A&M AgriLife times fall pre-emergent (for winter weeds such as annual bluegrass) to soil cooling to about 70°F for several days. The 50–55°F band is the spring trigger. Always read and follow the product label.
7-day forecast and frost risk
The latest National Weather Service 7-day forecast and any Frost Advisory or Freeze Warning for 99669 load here. You can also open the NWS forecast for this ZIP.
Pre-emergent
Soil is 40°F at 4 inches (estimated soil temperature, not a station reading). Fall pre-emergent window is mostly past. Next: spring, when soil reaches 50°F (typically mid-April to early May).
Fertilizer window
Lawn region: North (cool-season). Timing only; always follow the product label.
- Kentucky bluegrass (cool-season): Early fall: Around Labor Day (late August–September); Late fall: Late October–November, before the ground freezes; Late spring: Optional around Memorial Day. Avoid: Early-spring and midsummer feeding (pushes top growth, favors crabgrass).
Plant now
No vegetable planting windows are open this week.
Prune now
No frost-timed pruning windows are open this week.
Spring-flowering shrubs are pruned right after their flowers fade, not by date. See the pruning guide.
Last spring frost odds
| Chance of a 32°F freeze after this date | Date |
|---|---|
| 90% (early: most years still freeze after this) | May 26 |
| 50% (the "average" last frost) | Jun 11 |
| 10% (cautious: only 1 year in 10 freezes later) | Jul 7 |
Most gardeners plant frost-tender crops (tomatoes, peppers, basil) after the 50% date, and closer to the 10% date for less risk.
First fall frost odds
| Chance the first 32°F freeze has happened by this date | Date |
|---|---|
| 10% (early: 1 year in 10 freezes this soon) | Aug 11 |
| 50% (the "average" first frost) | Sep 1 |
| 90% (late: most years have frozen by now) | Sep 18 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | n/a | n/a |
| 32°F (freeze) | Jun 11 | Sep 1 |
| 28°F (hard freeze) | May 23 | Sep 16 |
n/a means NOAA did not publish a date at that threshold for this station (usually because it rarely gets that cold).
Vegetable planting calendar for 99669
Dates count from your average last spring frost (Jun 11) and first fall frost (Sep 1). Half of years have a frost after the spring date, so give tender crops (tomatoes, peppers, squash) some slack.
| Crop | Start indoors | Spring planting | Fall planting |
|---|---|---|---|
| Tomato | Apr 16–30 | Jun 18–Jul 2 (transplant) | – |
| Pepper (sweet and hot) | Apr 2–16 | Jun 25–Jul 9 (transplant) | – |
| Eggplant | Apr 2–16 | Jun 25–Jul 9 (transplant) | – |
| Tomatillo | Apr 16–30 | Jun 18–Jul 2 (transplant) | – |
| Lettuce | Apr 16–30 | May 21–Jun 11 (transplant) May 14–Jun 25 (sow outdoors) | Jul 7–28 (transplant) |
| Spinach | – | Apr 30–May 21 (sow outdoors) | Jul 7–28 (sowing) |
| Kale | Apr 16–30 | May 14–28 (transplant) May 14–28 (sow outdoors) | Jun 9–Jul 7 (transplant) |
| Collards | Apr 16–30 | May 14–Jun 11 (transplant) May 14–Jun 11 (sow outdoors) | – |
| Broccoli | Apr 2–16 | May 14–28 (transplant) | – |
| Cabbage | Apr 2–16 | May 14–28 (transplant) | – |
| Cauliflower | Apr 2–16 | May 28–Jun 11 (transplant) | – |
| Brussels sprouts | Mar 19–Apr 2 | May 14–28 (transplant) | – |
| Kohlrabi | Apr 16–30 | May 14–28 (transplant) May 14–28 (sow outdoors) | Jun 23–Jul 7 (sowing) |
| Bok choy / Asian greens | – | May 14–28 (sow outdoors) | Jul 7–21 (sowing) |
| Arugula | – | May 14–Jun 11 (sow outdoors) | Jul 7–Aug 4 (sowing) |
| Mustard greens | – | May 14–Jun 4 (sow outdoors) | Jul 7–21 (sowing) |
| Swiss chard | Apr 30–May 14 | May 28–Jun 18 (transplant) May 28–Jun 25 (sow outdoors) | – |
| Beet | – | May 14–Jun 11 (sow outdoors) | Jun 23–Jul 7 (sowing) |
| Carrot | – | May 21–Jun 18 (sow outdoors) | – |
| Radish | – | May 7–Jun 18 (sow outdoors) | Jul 21–Aug 4 (sowing) |
| Turnip | – | May 14–Jun 4 (sow outdoors) | Jun 23–Jul 7 (sowing) |
| Parsnip | – | May 21–Jun 11 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Apr 16–May 14 (sow outdoors) | Jun 9–23 (sowing) |
| Onion (bulbing) | Mar 19–Apr 2 | Apr 30–May 14 (transplant) | – |
| Green onion / scallion | – | Apr 30–May 28 (sow outdoors) | Jun 23–Jul 7 (sowing) |
| Leek | Mar 19–Apr 2 | May 14–28 (transplant) | – |
| Garlic | – | – | Jul 21–Aug 18 (sowing) |
| Shallot | – | Apr 30–May 14 (transplant) | Jul 21–Aug 18 (sowing) |
| Potato | – | May 14–28 (transplant) | – |
| Sweet potato | – | Jul 2–16 (transplant) | – |
| Sweet corn | – | Jun 18–Jul 2 (sow outdoors) | – |
| Bean, bush (snap) | – | Jun 18–Jul 2 (sow outdoors) | – |
| Bean, pole | – | Jun 18–Jul 2 (sow outdoors) | – |
| Lima bean | – | Jun 25–Jul 9 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Jul 2–23 (sow outdoors) | – |
| Cucumber | May 14–21 | Jun 18–Jul 2 (transplant) Jun 18–Jul 2 (sow outdoors) | – |
| Summer squash / zucchini | May 14–21 | Jun 18–Jul 2 (transplant) Jun 18–Jul 2 (sow outdoors) | – |
| Winter squash | May 14–21 | Jun 18–Jul 2 (transplant) Jun 18–Jul 2 (sow outdoors) | – |
| Pumpkin | – | Jun 18–Jul 2 (sow outdoors) | – |
| Watermelon | May 14–21 | Jun 25–Jul 9 (transplant) Jun 25–Jul 9 (sow outdoors) | – |
| Cantaloupe / muskmelon | May 14–21 | Jun 25–Jul 9 (transplant) Jun 25–Jul 9 (sow outdoors) | – |
| Okra | Apr 30–May 14 | Jun 25–Jul 9 (transplant) Jun 25–Jul 9 (sow outdoors) | – |
| Celery | Mar 19–Apr 2 | Jun 18–25 (transplant) | – |
| Basil | Apr 30–May 14 | Jun 18–Jul 2 (transplant) Jun 18–Jul 2 (sow outdoors) | – |
| Cilantro | – | May 28–Jun 25 (sow outdoors) | Jul 7–21 (sowing) |
| Parsley | Apr 2–16 | May 28–Jun 11 (transplant) May 21–Jun 11 (sow outdoors) | – |
| Dill | – | Jun 11–25 (sow outdoors) | Jul 7–21 (sowing) |
| Sunflower | – | Jun 11–25 (sow outdoors) | – |
| Asparagus (crowns) | – | May 14–28 (transplant) | – |
| Rhubarb (crowns) | – | May 14–28 (transplant) | – |
| Strawberry (plants) | – | May 14–28 (transplant) | Jun 23–Jul 21 (transplant) |
Typical ranges from university extension planting calendars, adjusted to your frost dates. Probabilities, not guarantees. Fall windows that would overlap spring planting are left out, as are fall crops of frost-tender plants where the frost-free season is under 210 days.
Where these numbers come from
Station: Soldotna 5SSW, AK (NOAA GHCN-Daily ID USC00508615), elevation 180 ft, 5.7 miles from the ZIP's center point. NOAA completeness flag: R (representative, 10+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Sterling 6SW, AK | 10 mi | May 20 | Sep 21 |
| Kenai Muni AP, AK | 17 mi | May 24 | Sep 12 |
| Kenai 9N, AK | 24 mi | May 18 | Sep 22 |
The average last-frost dates of these stations span 24 days, a rough guide to local variation. See data sources & methods.
Frost questions for 99669
When is the last frost in 99669?
The average (50% chance) last spring freeze of 32°F for ZIP 99669 is June 11. For a more cautious planting date, use July 7, when only 1 year in 10 still sees a later freeze.
When is the first frost in 99669?
The average first fall freeze is September 1. In 1 year in 10 it comes by August 11.
What hardiness zone is 99669?
ZIP 99669 is in USDA zone 4b (-25 to -20°F average coldest winter night), per the 2023 USDA Plant Hardiness Zone Map ZIP listing.
What is the soil temperature in 99669 right now?
This page shows the latest 2-inch and 4-inch soil temperature from the nearest public soil station (USDA SCAN, NOAA USCRN or TexMesonet), or a labeled estimate when no station is close, against the 50–55°F spring pre-emergent band.
Nearby ZIP codes
99610 Cohoe 99568 Clam Gulch 99672 Sterling 99639 Ninilchik 99611 Nikiski 99572 Cooper Landing 99556 Anchor Point 99631 Moose Pass
Other ZIP codes in Kenai Peninsula Borough
99556 99568 99572 99603 99605 99610 99611 99631 99635 99639 99663 99664 99672 99682 All Kenai Peninsula Borough frost dates · Alaska frost dates
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