Aleknagik, AK planting calendar
- USDA zone
- 4a−30 to −25 °F
- Last frost
- May 26avg, 32°F
- First frost
- Sep 15avg, 32°F
- Growing season
- 111days
Aleknagik, Alaska is in USDA plant hardiness zone 4a. Its average last spring frost is around May 26 and the first fall frost around September 15, giving a growing season of about 111 days (NOAA 1991–2020 normals, 32°F, median). Start tender crops like tomatoes and peppers indoors weeks before the last frost and set them out afterward; sow hardy crops such as peas, spinach, and lettuce before it. The planner below turns those frost dates into a printable per-crop planting calendar.
Aleknagik planting calendar
Each crop's windows are counted from Aleknagik's average frost dates. hatched = start seeds indoors, solid green = plant out, teal = a fall sowing, and the terracotta dot marks the estimated first harvest. Ranges are extension-guide planning guidance, not guarantees.
- Start indoors
- Plant out
- Fall sowing
- First harvest
| Crop | Frost tolerance | Start indoors | Plant out | First harvest | Fall planting |
|---|---|---|---|---|---|
| Tomato | Tender | Mar 31 – Apr 14 | Jun 2 – Jun 9 | Aug 1 – Aug 21 | — |
| Pepper | Very tender | Mar 17 – Mar 31 | Jun 9 – Jun 16 | Aug 8 – Sep 7 | — |
| Cucumber | Tender | Apr 28 – May 5 | Jun 2 – Jun 9 | Jul 22 – Aug 11 | — |
| Summer squash / zucchini | Tender | — | Jun 2 – Jun 9 | Jul 17 – Aug 1 | — |
| Bush bean | Tender | — | Jun 2 – Jun 9 | Jul 22 – Aug 1 | Jul 17 – Jul 27 |
| Sweet corn | Tender | — | May 26 – Jun 9 | Jul 25 – Aug 24 | — |
| Basil | Very tender | Apr 14 – Apr 28 | Jun 2 – Jun 9 | Jul 2 – Jul 17 | — |
| Lettuce | Half-hardy | Apr 14 – Apr 28 | Apr 28 – May 12 | Jun 12 – Jun 27 | Jul 3 – Jul 18 |
| Pea | Hardy | — | Apr 14 – Apr 28 | Jun 8 – Jun 23 | Jun 23 – Jul 8 |
| Spinach | Hardy | — | Apr 14 – Apr 28 | May 24 – Jun 3 | Jul 13 – Jul 23 |
| Carrot | Half-hardy | — | May 5 – May 12 | Jul 4 – Jul 24 | Jun 13 – Jul 3 |
| Broccoli | Half-hardy | Mar 31 – Apr 14 | Apr 28 – May 12 | Jun 22 – Jul 12 | Jun 18 – Jul 8 |
Data: NOAA NCEI U.S. Climate Normals 1991–2020 (public domain) and USDA Plant Hardiness Zone Map 2023. Planting windows synthesized from U.S. Cooperative Extension guides.
Frost & freeze dates
From NOAA's 1991–2020 Climate Normals at station USW00025503. The median (p50) is the average date; the 90%-safe column is the date the freeze has passed in about 9 years out of 10 (p10 for spring, p90 for fall) — the conservative date to plant after or harvest before.
| Threshold | Last spring — avg | Last spring — 90%-safe | First fall — avg | First fall — 90%-safe | Season (days) |
|---|---|---|---|---|---|
| 36°F | Jun 14 | Jul 4 | Sep 1 | Sep 16 | 77 |
| 32°F (freeze) | May 26 | Jun 11 | Sep 15 | Sep 29 | 111 |
| 28°F | May 8 | May 25 | Sep 27 | Oct 10 | 142 |
| 24°F | Apr 26 | May 9 | Oct 5 | Oct 21 | 163 |
32°F is the standard "freeze" line that damages tender crops; lighter 36°F frost can nip the most cold-sensitive plants, while hardy crops shrug off light frost down toward 28°F. Use the threshold that matches what you are protecting.
Growing degree days
Growing degree days (GDD) accumulate warmth above a base temperature over the year — a better predictor of crop development than the calendar alone. Warm-season crops need a long, warm GDD total; a short, cool GDD total favors greens and brassicas.
| Model | °F·days | Used for |
|---|---|---|
| Base 50°F (warm-season) | 566 | standard warm-season base (tomato, corn, beans) |
| Base 40°F (cool-season) | 1,977 | cool-season crops (brassicas, greens) |
Hardiness zone 4a
Aleknagik sits in USDA plant hardiness zone 4a on the 2023 map — meaning its average annual extreme minimum winter temperature is about −30 to −25 °F. That number tells you which perennials, shrubs, and trees reliably survive an average winter here; it does not set your planting dates, which come from the frost calendar above.
Explore more places in zone 4a, or see all USDA hardiness zones.
Frequently asked questions
- What USDA hardiness zone is Aleknagik?
- Aleknagik, Alaska is in USDA plant hardiness zone 4a on the 2023 map (average annual extreme minimum temperature −30 to −25 °F) — from the USDA Plant Hardiness Zone Map 2023, matched to this location's ZIP. See the methodology page for sources.
- When is the last frost in Aleknagik?
- The average (median) last spring frost at 32°F is around May 26, from NOAA's 1991–2020 climate normals at the nearest reporting station. Roughly one year in ten the last frost is as late as June 11, so wait until then before setting out frost-tender plants if you want to be safe.
- When is the first fall frost in Aleknagik?
- The average first fall frost at 32°F is around September 15. That leaves a growing season of about 111 days between the average last spring and first fall frosts.
- When should I start tomatoes in Aleknagik?
- Start tomato seeds indoors about Mar 31 – Apr 14 and transplant them outside about Jun 2 – Jun 9, once the danger of frost has passed. Estimated first harvest is around Aug 1 – Aug 21.
- How long is the growing season in Aleknagik?
- About 111 days at the 32°F threshold (NOAA 1991–2020, median) — the span between the average last spring frost (~May 26) and the average first fall frost (~September 15). Cold-hardy crops extend usable time at both ends; frost-tender crops fit inside it.
Sources & method
Frost, freeze, growing-season, and growing-degree-day figures are NOAA NCEI U.S. Climate Normals 1991–2020 for station USW00025503 (King Salmon, 146.6 km away). The hardiness zone is the USDA Plant Hardiness Zone Map 2023, matched to this location's ZIP. Planting windows are computed by counting from the average last and first frost using per-crop offsets synthesized from U.S. Cooperative Extension guides — the full method and citations are on the methodology page.